JPH03202256A - Detection method for uncut long material - Google Patents

Abstract

PURPOSE:To enable automatic detection of the uncut state of a long material by providing the detectors at the inlet and outlet sides of a cutting machine for detecting existence of the aforesaid long material at starting a cutting process. CONSTITUTION:When the leading end crop 1a and intermediate part of a steel pipe 1 are properly cut, the existence thereof is no longer detected with a detector 7. Also, when the trailing end crop 1b is properly cut, the steel pipe 1 is no longer detected with another detector 6. Consequently, if either of the detectors 6 and 7 senses the existence of the steel pipe 1 after a cutting process, the occurrence of an uncut condition can be identified. Upon recognition of the performance of a cutting operation on the basis of a signal from a cutting machine 2, a judgement part 8 monitors output signals from the detectors 6 and 7 for the predetermined time from the time of the recognition, and judges that an uncut condition occurs, if both the detectors 6 and 7 sense the existence of the steel pipe 1.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an uncut detection method in a long material cutting machine, such as a cutting machine that cuts a pipe into a predetermined length at the final stage of a pipe manufacturing process. .

[Prior art and problems to be solved by the invention] Long materials such as pipe materials and tribute materials are manufactured to have appropriate lengths in their respective manufacturing processes, and then transported in the longitudinal direction. In the meantime, a cutting machine placed midway along the conveyance path operates to cut the product into a predetermined length depending on the intended use. However, if this cutting is not done reliably and an uncut portion occurs, the conveyance equipment downstream of the cutting machine is configured based on the length of the product after cutting.
The product being transported may collide with various parts of the transport equipment, which may not only cause damage to both the product and the transport equipment, but may even endanger the operator.

Therefore, it is important to know whether the cutting condition of the cutting machine is good or not, especially the occurrence of uncut parts. Conventionally, a worker is assigned to each cutting machine to monitor the cutting condition, and if an uncut part is confirmed, it is important to know. The above-mentioned inconveniences are prevented from occurring by taking measures such as manually stopping the operation of the transport equipment from now on.

Monitoring the cutting state is a simple task, and the placement of monitoring workers hinders labor savings in the entire long material manufacturing process, but as mentioned above, reliable detection of uncut material is important. The deployment of monitoring workers has become unavoidable.

The present invention has been made in view of the above circumstances, and makes it possible to automatically detect whether or not a long material is uncut by a cutting machine, thereby eliminating the need for a worker to monitor the cutting state and facilitating the production of long materials. It is an object of the present invention to provide a method for detecting uncut long materials that can contribute to labor saving in the process.

[Means to solve the problem]

The uncut detection method for a long material according to the present invention is such that when a long material being conveyed in the longitudinal direction is cut by a cutting machine disposed midway through the conveyance route, the input side and the exit side of the cutting machine are A detector for detecting the long material is provided, and when both of the detectors detect the long material after the cutting machine operates, it is determined that the long material has not been cut.

[Effect]

In the present invention, when the cutting operation by the cutting machine is incomplete and uncut parts occur, the continuous long material is detected by both the detectors arranged on the entry side and the exit side of the cutting machine. , an uncut occurrence is detected.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof. FIG. 1 is a schematic diagram showing the implementation state of the uncut detection method for long materials according to the present invention (hereinafter referred to as the method of the present invention) in the process of cutting steel pipes, and FIG. 2 is a diagram showing the implementation of this cutting process. It is an explanatory diagram showing a procedure.

A long steel pipe 1 manufactured to have an appropriate length through a predetermined pipe manufacturing process is transported along its axis in the direction of the white arrow by the operation of a transport means (not shown). The material is cut into a predetermined length by a cutting machine 2 disposed midway along the transport route. The cutting machine 2 shown in this figure is provided with cutting units 3 and 4 each having a gripping means for a steel pipe 1 and a cutting tool on an entry side and an exit side. The steel pipe 1 transported as described above first stops with its tip protruding a predetermined length from the cutting unit 4 on the outlet side, and as shown in FIG. The crop 1a is cut.Next, the steel pipe l is conveyed a predetermined distance corresponding to the length of the product pipe to be obtained and then stopped, and by the operation of the cutting unit 3 on the entry side, the steel pipe l is cut as shown in FIG. 2(b). , the product tube 5 obtained by cutting at the broken line position in the figure is immediately conveyed to the subsequent process after cutting, as shown in FIG. Figure (b),
After repeating the process of (C) to obtain a predetermined number of product tubes 5,
The steel pipe 1 stops with its rear end protruding a predetermined length from the cutting unit 3 on the entry side, and the operation of the cutting unit 3 causes the rear end claw 7 1b to be cut as shown in FIG. 2(d). be done.

As described above, in the cutting process of the copper pipe 1, in order to enable detection of uncut state at each cutting time, in the method of the present invention, the steel pipe l is detected on the entrance and exit sides of the cutting machine 2. Detectors 6 and 7 are provided respectively. The detector 6 is arranged at a predetermined distance from the cutting unit 3 on the inlet side in the direction opposite to the conveying direction of the tube 1, and the detector 7 is arranged at a predetermined distance from the cutting unit 4 on the outlet side in the conveying direction of the tube 1. They are placed long apart.

These detectors 6.7 are, for example, transmission type or reflection type photoelectric switches arranged in a plane including the axis of the pipe 1, etc., when the steel pipe 1 is present or not in the respective arrangement position. Any configuration may be used as long as it outputs different signals between the two. The output signal of the detection 6.7 is given to a determining section 8, and this determining section 8 is also supplied with a signal from the cutting machine 2 indicating its operating state.

Now, if the cutting of the tip crop 1a shown in Fig. 2 Ta) is performed correctly, the cut pieces will fall on the exit side of the cutting machine 2, so the steel pipe 1 will not be detected by the detector 7 on the exit side, and If the cutting in the middle shown in FIG.
Detection of the steel pipe 1 by
) If the cutting of the rear end crop 1b shown in ) is performed correctly, the cut pieces will fall on the entry side of the cutting machine 2, so that the steel pipe 1 will not be detected by the detector 6 on the entry side. On the contrary, if both the detectors 6 and 7 detect the presence of the steel pipe 1 after cutting, it is recognized that the cutting is incomplete and an uncut portion is present.

When the determination unit 8 recognizes that a cutting operation has been performed based on the signal from the cutting machine 2, it monitors the output signals of the detectors 6 and 7 for a predetermined period of time from this point on, and both of them monitor the steel pipe 1. If detected, it is determined that uncut has occurred.

After making this determination, the determining unit 8 issues an operation command to, for example, an alarm device 9, and the operation of the alarm device 9 notifies the operator of the occurrence of an uncut state. Furthermore, in addition to this, it is also possible to issue a stop command to the cutting machine 2 and the conveyance system of the steel pipe 1 to stop the cutting operation itself.

In this embodiment, the cutting process using the cutting machine 2 equipped with two cutting units 3.4 was explained, but the method of the present invention can also be applied to a cutting machine equipped with a single cutting unit or three or more cutting units. It is possible to apply

Further, in this embodiment, the process of cutting the steel pipe 1 has been described, but it goes without saying that the method of the present invention is applicable to cutting all kinds of long materials such as pipe materials and bars.

〔effect〕

As detailed above, in the method of the present invention, when the cutting operation by the cutting machine is incomplete and an uncut occurs, it is detected by both the detectors placed on the entry side and the exit side of the cutting machine. As a result, it is possible to automatically and reliably determine whether or not the material has been cut, eliminating the need for a worker to monitor the cutting state, and achieving significant labor savings in the process of manufacturing long materials. play.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram showing the implementation state of the method of the present invention in the process of cutting steel pipes, and FIG. 2 is an explanatory diagram showing the implementation procedure of this cutting process.

Claims (1)

[Claims] 1. When cutting a long material conveyed in the longitudinal direction with a cutting machine disposed midway through the conveyance route, a detector is provided to detect the long material on the entrance and exit sides of the cutting machine, 1. A method for detecting uncut length of a long material, characterized in that the uncut state is determined when both of the detectors detect the cutter after operation of the cutting machine.