JP2004217232A - Method for determining poor binding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To determine poor binding by a change in pressure of a hydraulic motor for twisting crossed parts together, when a wire is wound in a looped shape on a material to be bound, such as a steel material, so that the crossed parts thereof can be twisted together and bound. <P>SOLUTION: The crossed parts of the wire 10, which is wound in the looped shape on the material to be bound, such as the steel material, are held by a clamping jaw 30, and the clamping jaw 30 is rotated by the hydraulic motor 34, so that the crossed parts of the wire 10 can be twisted together and bound. In a process wherein the crossed parts are twisted together, the pressure of the hydraulic motor 34 is detected by a pressure sensor 40, and the poor binding is determined on condition that this detected value is made lower than a preset threshold value. The pressure sensor 40 is set to start the detection of the pressure from the time of a lapse of prescribed time from the start of the twisting of the wire 10 by the running of the hydraulic motor 34. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, when a wire is wound around a material to be tied such as a steel material in a loop shape and the intersection thereof is twisted and bound, a binding failure is determined by a pressure change of a hydraulic motor for twisting the intersection. The present invention relates to a method of determining a binding failure to be performed.
[0002]
[Prior art]
When shipping long materials (materials to be tied up) such as steel materials from factories, bundle them with wires every predetermined unit suitable for transportation in order to prevent collapse during transportation and facilitate transportation. I'm packing. This bundling work is to wrap the wire in a loop around the material to be tied up to some extent in advance, and twist the intersection of the wire to bind the material to be tied in a tight state with the wire. Is performed by a binding machine.
[0003]
As shown in FIG. 5, the binding machine 12 includes an annular guide frame 14 through which the material to be bound is inserted, and an inner circumferential surface of the guide frame 14 so that the wire 10 surrounds the material to be bound. And a supply groove 16 for guiding the wire 10 toward the guide groove 14a. The supply means 16 sandwiches the wire 10 between a main pinch roller 17 and an auxiliary pinch roller 18 disposed opposite to each other, and rotates the main pinch roller 17 forward and reverse by a motor (not shown) capable of normal and reverse rotation. It is configured to move the wire 10 forward and backward. When the wire 10 is fed out by the supply means 16, the wire 10 surrounds the material to be tied in a loop along the guide groove 14a, and the leading end of the wire 10 intersects the wire 10 on the payout side. Further, the distal end of the wire 10 abuts on the positioning portion 22 and is held by the holding head 21 provided in the positioning means 20. Next, the wire 10 is pulled back by the reverse rotation of the main pinch roller 17, and the wire 10 is drawn down to the outer periphery of the material to be tied. Thereafter, the crossing portion of the wire 10 is gripped by a clamping jaw 30 as gripping means, and the payout side of the wire 10 is cut by a cutting means 26 provided with a shear 28.
[0004]
Then, the hydraulic motor 34 constituting the torsion means 32 rotates the clamping jaw 30 gripping the intersection of the wire 10 a predetermined number of times, whereby the intersection is twisted and the material to be tied is narrowed down. The materials are bound in a tight state (for example, see Patent Document 1).
[0005]
After the completion of the above-described twisting step, the distal ends of the wires 10 are each opened outward in a C-shape, which hinders the transportation. Therefore, in the binding machine 12, an end adjusting means 42 having a pressing head 44 for pressing each end of the wire 10 toward the material to be tied is provided, and the end adjusting means 42 adjusts each end of the wire 10 by the end adjusting means 42. It is configured to perform processing.
[0006]
[Patent Document 1]
JP-A-64-23908
[Problems to be solved by the invention]
In the binding step of the material to be bound, poor binding of the wire 10 causes collapse of the load during transportation, and is a serious problem. Factors of the binding failure include the fact that the clamping jaw 30 cannot grip the intersection of the wire 10 and that the wire 10 comes off the clamping jaw 30 during the twisting. As a result, the wire 10 is not sufficiently twisted, the intersection portion of the wire 10 is disengaged, the wire 10 is not sufficiently narrowed, and the binding condition of the material to be tied is loose, and a binding failure occurs. Further, the detachment of the wire 10 during the twisting is performed so that each tip of the wire 10 does not arrive at an appropriate position when the twisting is completed, and the tip of the wire 10 does not protrude outward. Also, it is pointed out that the end processing of pushing the wire 10 toward the material to be bound by the trimming means 42 cannot be performed normally, and the tip of the outwardly protruding wire 10 is caught during transportation.
[0008]
However, in the binding process by the conventional binding machine 12, the above-described binding failure is not detected, and in most cases, the binding failure is found during actual transportation. In addition, after the completion of the twisting process, by inspecting the binding portion, it is possible to find a binding failure to some extent, but the inspection has a problem that it takes time and effort. In addition, since the binding state of the wire 10 is the same as that in the normal state, the operator often overlooks the binding state of the wire 10 in a loose state, and it is difficult to eliminate trouble during transportation.
[0009]
[Object of the invention]
SUMMARY OF THE INVENTION The present invention has been proposed in view of the problems inherent in the prior art, and has been proposed to solve the problem in a favorable manner. In a wire twisting process, a bonding failure that can determine a binding failure of the wire is provided. The purpose of the present invention is to provide a method for determining
[0010]
[Means for Solving the Problems]
In order to overcome the above-described problems and achieve a predetermined object, a method of determining a poor binding according to the present invention is to hold a crossing portion of a wire wound around a material to be bound such as a steel material in a loop shape by a gripping means. By rotating the gripping means with a hydraulic motor, when twisting and binding the intersections of the wires,
The pressure of the hydraulic motor is detected by a pressure sensor, and a binding failure is determined on condition that the detected value falls below a preset threshold.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a method of determining a binding failure according to the present invention will be described below with reference to a preferred embodiment in relation to a binding machine capable of suitably performing the method. The structure of the binding machine itself is basically the same as that of the related art described with reference to FIG. 5, and therefore, the same reference numerals are used for the already described members, and detailed description thereof is omitted.
[0012]
In the binding machine of the present embodiment, as shown in FIG. 1, a pressure sensor 40 is disposed on the hydraulic motor 34 constituting the torsion means 32, and the pressure at the time of rotation of the hydraulic motor 34 in the twisting process is The pressure sensor 40 detects the pressure. The rotational drive of the hydraulic motor 34 is transmitted via a transmission mechanism 48 (see FIG. 4) to the clamping jaw 30 serving as a gripper that grips the intersection of the wire 10. Here, the twisting step is to rotate the clamping jaw 30 holding the intersection of the wire 10 looped around the material to be bound in the previous step by the hydraulic motor 34 and twist the intersection of the wire 10. It refers to a work process of performing the joining, and indicates a part of the binding process of the wire 10.
[0013]
With the rotation of the hydraulic motor 34, the clamping jaw 30 is rotated, and when the intersection of the wire 10 is twisted, the resistance to the rotation that the clamping jaw 30 receives from the wire 10 is transmitted through the speed change mechanism 48. The pressure of the hydraulic motor 34 is changed. The pressure sensor 40 is configured to detect the changing pressure of the hydraulic motor 34 so as to detect the resistance of the wire 10 to the rotation at the time of twisting. The detection value of the pressure by the pressure sensor 40 is input to a control circuit 46 (see FIG. 4), and the control circuit 46 performs a failure determination described later.
[0014]
In the embodiment, the hydraulic motor 34 is rotated by a stopper (not shown) provided in the transmission mechanism 48 at a position where the clamping jaw 30 starts to twist the wire 10 by 3/4 of a rotation. It is being regulated. The transmission mechanism 48 adjusts the gear ratio of the gear connected to the clamping jaw 30 and the gear connected to the hydraulic motor 34 so that the clamping jaw 30 is rotated when the hydraulic motor 34 rotates 3/4. It is set to make 1/4 rotation once. That is, in the embodiment, the hydraulic motor 34 rotates ３ in one twisting step, so that the intersection of the wire 10 gripped by the clamping jaw 30 is twisted once and １ ／ turn. It has become so. The rotation speed detecting means 50 (see FIG. 4) is connected to the hydraulic motor 34, and when the detection means 50 detects the rotation speed (3/4 rotation) restricted by the stopper, the hydraulic motor 34 is stopped. It is set as follows. After the twisting step is completed, the control circuit 46 controls the hydraulic motor 34 to rotate in the reverse direction so that the clamping jaw 30 rotates in the reverse direction and returns to the reference position.
[0015]
The pressure applied to the hydraulic motor 34 in the twisting step will be described in order to help the understanding of the method for determining the binding failure according to the present invention. As shown in FIG. 2, in the normal twisting process, when the twisting of the wire 10 is started, the pressure applied to the hydraulic motor 34 suddenly increases in order to start the clamping jaw 30, Then the pressure drops. Then, after the wire 10 sharply rises due to the resistance of being twisted, the pressure gradually rises as the material to be tied is narrowed. When the rotation speed detecting means 50 detects the rotation speed, the hydraulic motor 34 is stopped. At this time, the pressure of the hydraulic motor 34 sharply rises because the rotation is restricted by the stopper. As described above, the pressure applied to the pressure motor 34 gradually changes after a predetermined time from the start of the twisting process.
[0016]
On the other hand, in the case where the wire 10 comes off from the clamping jaw 30 in the twisting step which causes a binding failure, for example, the case where one end of the wire 10 comes off from the clamping jaw 30 immediately after the start of the twisting. 3 (a). Immediately after the start of the twisting, a pressure change similar to that in the normal twisting process is exhibited, but when the wire 10 comes off the clamping jaw 30 (P), the pressure rapidly decreases. This pressure drop is due to a decrease in the resistance of the wire 10 due to the wire 10 coming off the clamping jaw 30. Then, after the pressure is reduced, the hydraulic motor 34 is changed at a pressure lower than the normal pressure transition in the twisting step, and the hydraulic motor 34 is stopped when the rotation detecting means 50 detects the above-mentioned number of rotations. FIG. 3B shows a case where the wire 10 comes off from the clamping jaw 30 when the wire 10 is twisted once. At this time, until the wire 10 comes off the clamping jaw 30, the pressure change is the same as in the normal twisting process, but suddenly after the wire 10 comes off the clamping jaw (P). Pressure has dropped. As described above, when the wire 10 comes off the clamping jaw 30, the pressure of the hydraulic motor 34 decreases rapidly, and the subsequent pressure transition also changes to be lower than normal.
[0017]
As shown in FIGS. 2 and 3, the pressure sensor 40 has passed a predetermined time from the start of the twisting step by the hydraulic motor 34, that is, a time indicating a pressure change accompanying the starting of the clamping jaw 34. It is set to detect the pressure of the hydraulic motor 34 later. The detection start time of the pressure sensor 40 is set by a method such as delaying the detection start timing of the pressure sensor 40 by the timer 52. In addition, the control circuit 46 determines a binding failure on the condition that the detected value of the pressure of the hydraulic motor 34 falls below a preset threshold Q during the detection time of the pressure sensor 40, and outputs an alarm by the alarm device 54. It is configured as follows. The threshold value Q is set to a value lower than the lowest pressure when the pressure gradually increases in the normal twisting process.
[0018]
That is, in the twisting process, the resistance to the rotation received from the wire 10 held by the clamping jaw 30 is transmitted to the hydraulic motor 34 that is linked. Therefore, as described above, the pressure change of the hydraulic motor 34 in the normal twisting process is such that the pressure increases with time due to the resistance of the wire 10, and when the wire 10 comes off from the clamping jaw 34, an abnormal case occurs. Due to the decrease in the resistance of the wire 10, the pressure of the hydraulic motor 34 decreases rapidly. Therefore, when the detected value falls below the preset threshold value Q, it can be determined that the wire 10 has come off the clamping jaw 30. Thus, in the twisting process, a change in pressure over time of the hydraulic motor 34 is detected, and a pressure drop below the threshold value Q is detected, thereby making it possible to determine a binding failure.
[0019]
Operation of the embodiment
Next, the operation of the method for determining a binding failure according to the present embodiment will be described. As shown in FIG. 4, the wire 10 wound around the material to be bound in a loop by the binding machine 12 is rotated by a hydraulic motor 34 through a speed change mechanism 48 so that the wire 10 The crossing portion of the wire 10 is twisted by rotating the clamping jaw 30 by transmitting the gripping portion to the clamping jaw 30, and the wire 10 narrows and binds the material to be bound.
[0020]
In the twisting step, the timer 52 is counted at the same time when the rotation drive of the hydraulic motor 34 is started. When a predetermined time is counted, the pressure sensor 40 starts detecting the pressure of the hydraulic motor 34. If the crossing portion of the wire 10 is securely gripped by the clamping jaw 30, the value detected by the pressure sensor 40 does not fall below the threshold value Q. In this case, the control circuit 46 determines that the binding is normal. Is determined to have been performed. On the other hand, when the pressure of the hydraulic motor 34 falls below a preset threshold value Q (FIGS. 3A and 3B), the control circuit 46 determines that a binding failure has occurred, and the control circuit 46 46 causes the alarm device 54 to output an alarm. Therefore, the worker can recognize that the binding failure has occurred, and can quickly take appropriate measures. That is, it is possible to prevent the collapse of the load due to the poor binding and to prevent the leading end of the wire 10 from being caught due to the poor end processing. Also, since the pressure at the time of wire bundling is detected, a loose bundling condition that looks the same as a normal bundling condition can be reliably determined to be defective, and the material to be tied after bundling can be reliably determined. Trouble during transportation can be eliminated. Further, by changing the setting of the threshold value Q in accordance with the diameter of the wire 10 or the like, it is possible to determine a binding failure with high accuracy.
[0021]
The pressure sensor 40 is configured such that a timer 52 delays a time period in which a pressure drop occurs due to a device such as the clamping jaw 30 immediately after the start of twisting, which is common to pressure changes in a normal and abnormal twisting process. , So that the pressure in the time zone is not detected. Therefore, only the pressure change caused by the resistance of the wire 10 when the wire 10 is narrowed is detected, and the pressure change caused by the device immediately after the start of the twisting is not detected. Further, by changing the setting of the detection start time of the pressure sensor 40 in accordance with the diameter of the wire 10 or the like, it is possible to determine the binding failure with high accuracy.
[0022]
【The invention's effect】
As described above, according to the method for determining a poor binding of the wire according to the present invention, in the twisting step, the poor binding of the wire based on the pressure change of the hydraulic motor caused by the wire coming off from the gripping means or the like. Is determined, it is possible to cope with the binding failure in the twisting step, it is possible to prevent the collapse of the load due to the binding failure beforehand, and it is also possible to prevent the wire tip from being caught by the end processing failure and the like. is there. In addition, by delaying the pressure detection start timing by the pressure sensor by a predetermined time from the start of the twisting, only the pressure change due to the wire twisting can be detected, and a highly accurate failure determination can be performed. In recent years, due to the progress of rationalization of warehouses and logistics, handling using rifmag has increased. Insufficient binding of the wires causes a loss of the balance of the suspended load and causes a drop of the suspended load, thereby causing not only a safety problem but also a deterioration in workability. However, by adopting the method of the present invention, it is possible to solve the above-mentioned problem, and it can be expected that the method will be applied to automation of a warehouse.
[Brief description of the drawings]
FIG. 1 is a front view of a main part of a binding machine according to a preferred embodiment of the present invention.
FIG. 2 is a graph showing a change in pressure of a hydraulic motor in a normal twisting process.
3A and 3B are graphs showing a change in pressure of a hydraulic motor in an abnormal twisting process, in which FIG. 3A shows a case where one wire is disconnected immediately after starting twisting, and FIG. A case where one wire is detached later is shown.
FIG. 4 is a block diagram illustrating a binding machine according to the embodiment.
FIG. 5 is a front view of a main part of a binding machine according to a conventional technique.
[Explanation of symbols]
Reference Signs List 10 wire, 30 clamping jaw (gripping means), 34 hydraulic pressure 40 pressure sensor

Claims (2)

By gripping the intersection of the wire (10) wound around the material to be bound such as steel in a loop with the gripping means (30), and rotating the gripping means (30) using the hydraulic motor (34) as a drive source. When twisting and binding the intersections of the wire (10),
A pressure sensor (40) monitors pressure fluctuations of the hydraulic motor (34) from the start of the binding of the wire (10) to the completion of the binding, and
The connection failure of the wire (10) is determined on condition that the detection value of the pressure sensor (40) during the monitoring is lower than a predetermined pressure drop value that may occur at the time of the connection failure. A method for determining a bonding failure. 2. The method according to claim 1, wherein the detection of the pressure by the pressure sensor is started at a point in time when a predetermined time has elapsed from the start of the twisting of the wire by the rotation of the hydraulic motor.

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