JPH06127670A - Adjusting method for product carrying pitch - Google Patents

Abstract

PURPOSE:To prevent the occurrence of troubles, and thereby enhance production efficiency by suspending 1' the motion of the carrying rollers of table roller groups at the upstream side of a detector for a set period of time to allow a carrying pitch to be automatically adjusted when the carrying pitch is locally shortened. CONSTITUTION:The minimum value of the carrying pitch between products, is set in advance. And the actual carrying pitch is measured by a product detector and a hour meter which are located between two table roller groups. A carrying pitch TA outputted by the detector is outputted to the hour meters A and A' so as to be compared with a minimum limit value tA outputted by a integral minimum pitch setter respectively. When TA>tA, carrying is kept on with no control executed. When TA<=tA, it is feared that defective transshipping may take place, signals are outputted to a table roller group control means, a table roller group suspension hour meter, and an integral table roller group suspension time setter, so that an electric motor driving a table roller group B carrying the following members, is once suspended for the period of time tB so as to be restarted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting a conveying pitch of products, such as shaped steel and steel pipe, which are successively conveyed one by one. More specifically, the present invention relates to a product conveyance pitch adjusting method capable of automatically adjusting the conveyance pitch of conveyed products so as to be closer to equal intervals.

[0002]

2. Description of the Related Art Products, such as shaped steel and steel pipe, which are continuously conveyed one by one in a longitudinal direction, are cut and divided into a predetermined length after rolling, for example, and then continuously. A plurality of table roller groups each constituted by a plurality of transport rollers arranged in series are sequentially transported to a downstream process by a roller table line in which a plurality of table roller groups are continuously arranged.

FIG. 5 schematically shows an example of the present transportation equipment for lightweight H-section steel. FIG. 5 (a) is an overall view, and FIG. 5 (b) is FIG.
FIG. 6 is a perspective view showing a part of the drawer device 13 in (a). Figure 5
As shown in (a), the rolled material is conveyed in the order of the welding machine 10, the cutting machine 11 and the defective short product rejecting device 12, and the drawing device 13 moves to the position shown in B as shown in FIG. 5 (b). When the front end of the rolled material 18 shields the installed optical detector 17, the transport roll is lowered (pulled out), and the rear end of the rolled material is moved in front of the optical detector 19 installed at the position indicated by A. The rotation of the transport roll is stopped when the light passes and is received,
As shown in, another drive device is used to
It is taken in in the crossing direction, sent to the roller table line installed downstream of the drawing device 13, and then conveyed to the transfer device 16 via the coating machine 15.

However, in this transfer facility, when the difference in passage time between the leading edge of the preceding material and the leading edge of the following material (referred to as "conveyance pitch" in this specification) fluctuates, the temperature in the downstream process of the drawing device is increased. In equipment (for example, the transfer device 16), a trailing material may collide with a preceding material, which may cause a transport trouble. The causes are as follows.

With respect to the non-welded portion and other defective portions which are generated when the mill is stopped, the transverse joint portion between the coils is cut by the cutting machine 11 into short pieces only in the manufacturing line. The cut defective portion is rejected by the defective short product rejecting device 12, but in order to minimize the yield loss, the defective product before the short defective product may be arranged. For example, if the length to the defective portion is 5 m when continuously cutting the product having a length of 8 m, first cut the length of 5 m to obtain the product, and then to the defective product. For example, after cutting the part to a length of 1 to 2 m, the product of 8 m is sampled again, so to speak, only the defective part is rejected. Therefore, in this case, the cut length of the product partially varies.

For example, when the product length of the trailing material becomes shorter than that of the preceding material in this way, the drawer 13
As described above, the leading edge (top) of the preceding material is detected and pulled out, a gap is provided with the next product, the trailing edge (bottom) is detected and feeding is stopped, and then the chain is moved in the right-angled direction. The product is taken in to, but when one product is taken in, one is paid out from the outgoing side, and the taking in of the product at the incoming side and the payout of the product at the outgoing side are linked.

In this way, since the conveying pitch of the process after the drawing device is determined by the drawing device, if a product with a short product length is taken in, the process after the drawing device is
The conveyance pitch becomes short in this portion. Therefore, product 18
When the length is short, the operating pitch of the take-in chain is shortened by that amount, so that the pitch is similarly shortened in the subsequent transport table, and the product transport pitch is shortened.

Since most of the equipment after the withdrawal device has a fixed work time for one cycle, such as the transfer device 16, the products are sent at a conveyance pitch shorter than the one cycle. In such a case, the transfer cannot be performed and the rear-end collision trouble as described above occurs.

In order to prevent such a situation from occurring, the welding line may be cut at a slower speed so as to cut the welding line, and the conveyance pitch may be set to at least ensure the maximum cycle of the transfer device or the like. However, this significantly lowers the production efficiency. Will end up. It is also known to reduce the welding speed of the welding machine 10 and lengthen the cutting pitch of the cutting machine before the length of the product is shortened in order to prevent troubles, but when the length change occurs Must be constantly monitored.

As means for controlling the product conveying speed when a plurality of products are continuously conveyed, for example, Japanese Patent Publication No. 53-83.
As shown in FIG. 6, the publication No. 07 has two table roller groups 21 and 22, and a preceding material 23 is a first stage table roller group.
According to the difference in passage time between the trailing edge of the preceding material and the leading edge of the following material that has passed through 22 (hereinafter referred to as "interval"), the two table roller groups 21 and 22 are respectively A method has been proposed in which the distance between the preceding material 23 and the following material 24, which have been conveyed apart, is shortened by changing the relative speed of the conveying rolls 25, 26. In the figure, reference numeral 27 is an optical detector, reference numeral 28 is a converter, reference numerals 29 and 30 are electric motors, reference numerals 31 and 31 ′ are control devices, reference numeral 32 is an addition calculator, Reference numerals 33 and 37 denote comparison circuits, reference numerals 34 and 36 denote gate circuits, and reference numeral 35 denotes a storage circuit.

In this method, (a) the presence of the products 23, 24 is detected by the change in the electric current of the electric motors 25, 26, (b) the preceding material 23.
The distance between the trailing member 24 and the trailing member 24 is detected by an optical detector such as a photoelectric tube or a proximity switch. (C) The relative speed difference between the leading member 23 and the trailing member 24 is determined by conveying the leading member 23. Table rollers
It is controlled by decelerating 21 or accelerating the table roller group 22 that is conveying the trailing material 24,
(d) The drive source of the table roller groups 21 and 22 is characterized in that the speed is variable DC motors 25 and 26.

Further, in Japanese Unexamined Patent Publication No. 52-70291, the positions of the trailing edge of the leading material and the leading edge of the trailing material are detected by two independent optical detectors, and A method has been proposed in which the interval is continuously measured and the speed of at least one of the preceding material and the following material is controlled so that this measured value becomes equal to the interval setting value so that the following material can catch up with the preceding material. ing. In this method, optical detectors are arranged above and below the conveyance line to detect the passage of the product and measure the distance between the preceding material and the succeeding material to reduce the deviation between the measured distance and the set value. To control the speed of the line drive motor.

[0013]

However, all of these conventional techniques are characterized in that the distance between the products is measured and the distance between the products is controlled to decrease.
The conveyance pitch cannot be made constant.

Particularly, in the method proposed by Japanese Patent Publication No. 53-8307, the detection of the material, that is, the detection of the preceding material and the following material is performed by the optical detector 27 in FIG. 6 and the electric motors 29, 30. In order to confirm the presence of the product 18 by the change in the current of the motor 18, the motor 2
The reliability is poor because the current values of 9 and 30 change greatly.

Further, in both the methods proposed in Japanese Patent Publication No. 53-8307 or Japanese Patent Publication No. 52-70291, it is necessary to use a DC electric motor in order to provide a relative speed difference to the electric motor. Since the table roller is decelerated or accelerated, the structure of the device becomes complicated and the equipment cost increases. The characteristic of both is that the distance between the products is measured and detected, and the distance is controlled to be closer. According to these conventional methods,
The product and the product conveyance pitch are controlled in the direction of reduction.

Further, even if the length of the products conveyed back and forth is changed, the interval between these products is controlled to be kept constant. Therefore, in the case of short products, the conveyance pitch is controlled to be smaller. To be done. Therefore, after being controlled by these methods, one cycle time must be shortened according to the reduced conveyance pitch, or a highly efficient equipment capable of handling a product with the shortest conveyance pitch must be provided. If the equipment with high efficiency is not installed, even if the transportation pitch itself is shortened, it cannot be processed and the production efficiency is not increased.

As described above, in the conventional method, it was not possible to make the conveying pitch of the conveyed products constant. Moreover, the conventional method is not only poor in reliability, but also at low cost, automatically detects and adjusts the product conveyance pitch, prevents problems from occurring, and maximizes production efficiency. I couldn't do that.

It is an object of the present invention to solve the problems of the above-mentioned prior art and to adjust the transfer pitch of the products to be automatically adjusted so that the transfer pitches of the products to be conveyed are close to equal intervals. And to maximize the production capacity without increasing the facility capacity of the downstream process after the process of adjusting the conveyance pitch.

[0019]

SUMMARY OF THE INVENTION Here, the gist of the present invention is to provide at least a table roller group composed of a plurality of conveying rolls which are continuously arranged in series and driven by synchronous drive sources. A method for adjusting a conveyance pitch when a product is conveyed by a roller table line which is continuously provided with two groups, and which continuously uses a detector installed between two adjacent table roller groups. When measuring the transport pitch between the products to be transported, and the measured transport pitch is equal to or less than the preset transport pitch limit value, the transport roll of the table roller group located adjacent to the upstream side of the detector, This is a method for adjusting a product conveyance pitch, which is characterized by starting after stopping for a preset time.

Specifically, on a roller table line, a plurality of table roller groups, which are arranged in series in series and are composed of transport rollers driven by synchronous drive sources, are continuously provided in series. Method for adjusting the conveyance pitch between the preceding product and the succeeding product. (I) The detector that detects the product conveyed between the table roller groups and the timer and the detector. Installed two time meters for measuring the product conveyance pitch based on the detected signal, and (ii) the conveyance pitch measured by this time meter and the preset minimum limit value of the conveyance pitch.
(If it is smaller than this, the limit value that will cause transfer trouble such as transfer failure in the downstream process) is compared.If the measured transfer pitch is less than the minimum limit value, the succeeding material is transferred. The method for adjusting the product conveyance pitch is characterized in that only the driving device of the table roller group is automatically stopped for a predetermined time set in another time meter and then automatically restarted.

The present invention is carried out as follows. A detector such as a photoelectric tube or a proximity switch is installed between two table rollers arranged in series so as to detect the leading end of the product (preceding material) being conveyed.

A time meter for measuring the product conveyance pitch by the detection signal of the detector is started. The leading edge of the trailing material is detected in the same manner as the above, the time meter is stopped at the same time as the detection, the measured value of the transport pitch is obtained, and the measured value is compared with a preset minimum limit value of the transport pitch.

If the measured time is less than the minimum limit value, the table roller group that is conveying the trailing material is stopped for a predetermined set time and then restarted. In this case, the table roller group that is conveying the product after the preceding material and the following material is not stopped. Also, the set value of the stop time is the product transfer pitch, transfer speed, transfer / transfer of transfer equipment in downstream processes.
It is set appropriately according to the processing capacity and the like. In the present invention, the upstream side refers to the preceding process side in the product transport direction.

[0024]

The operation of the present invention will be described in detail below. Briefly stated, the present invention sets the minimum value of the conveyance pitch between products in advance, and determines the actual conveyance pitch for each rolled material by a product detector and a time meter installed between two table roller groups. If the measured value is less than the minimum limit value of the conveyance pitch, the electric motor that is the drive source of the table roller group that conveys the succeeding rolled material is temporarily stopped to increase the conveyance pitch, and then the electric motor By restarting, the conveyance pitch is made uniform and the conveyance failure in the subsequent process is prevented.

Further, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an explanatory diagram showing a method for adjusting a product conveyance pitch according to the present invention. As shown in the figure, the product detection signal (measured carrier pitch: T
_A ) is output to the time meters A and A ', and is compared with the minimum limit value t _A output from the minimum pitch setter incorporated in each of the time meters A and A'.

When T _A > t _A , the product is conveyed in this state without any control, but when T _A ≦ t _A , the table roller group controller and the table roller group stop time meter Also, a signal is output to the table roller group stop time setter built into the table roller group stop time meter to stop the conveyance rolls of the table roller group conveying the succeeding material for the set time t _{B and} restart. To do.

FIG. 2 (a) is an explanatory view conceptually showing a conventional transfer line, and FIG. 2 (b) is a conceptual view of a transfer line to which the product transfer pitch adjusting method according to the present invention is applied. It is an explanatory view shown. In FIG. 2, reference numeral 20 is a conveyance pitch detector, and reference numerals a, b, c and d are products, which are respectively conveyed in the arrow directions. Reference numeral M denotes an electric motor that is a drive source of the transport roll R, and in this example, three table motors A, B, C, and D are used to drive the table rollers.
Is configured. The conveyance pitch in FIG. 2A is between product a and b: T _A , between product b and c: T _B , product c and d.
Between: T _B. However, T _A <T _B.

In the past, since the products were successively conveyed to the drawer with the same conveyance pitch, if the cycle time of the equipment (eg, transfer device) arranged downstream of the drawer is longer than the conveyance pitch T _A. , Product a to product b
Had a rear-end collision. On the other hand, in the present invention, as shown in FIG. 2B, the product conveyance pitch detector 20 is provided between the two table roller groups A and B. The type of the carrier pitch detector 20 may be, for example, a known non-contact type detector and is not limited to a particular type, but it is desirable to use, for example, a photoelectric tube or a proximity switch in consideration of the cost.

Since the change in the conveyance pitch occurs after passing through the drawing device, it is desirable to install the conveyance pitch detector in the roller table line after passing through the drawing device. An example of the installation location is shown in Fig. 5 (a).
Show as. Further, in the present invention, the rotation of the electric motor M of the transport roll R is controlled by a signal from the outside so that all the transport rolls of each table roller group can be stopped and restarted for a fixed time. A known control system may be used.

In the present invention, first, the tip of the product (preceding material) conveyed by the detector is detected, and at the same time when the detection of the product is started, the time counter (timer) is activated to start the time measurement. Next, stop the time counter when the tip of the product (subsequent material) is detected,
The conveyance pitch T _A between the preceding material and the following material is measured. In addition, it is desirable to provide two time meters for measuring the conveyance pitch and alternately measure the conveyance pitch. On the other hand, the minimum limit value t _A of the transport pitch that does not cause transfer defects or the like is set in advance. The minimum limit value t _A may be calculated or may be appropriately set based on experience.

Then, this minimum limit value t _A is compared with the measured transport pitch T _A, and I. When the transport pitch T _A > the minimum limit value t _A , there is no possibility of causing a transfer failure or the like, and therefore the transport is performed as it is. II. If the conveyance pitch T _A ≦ minimum limit value t _A , a transfer failure or the like may occur. Therefore, the group of table rollers B conveying the succeeding material is stopped for a preset time t _B. Table roller A group that conveys the preceding material and table roller C that conveys the succeeding product from the succeeding material
The group and group D are not changed at all, and the conveyance is continued. The time t _B is measured by using another time meter. In addition, the decision should be made so that the conveyance pitches of the preceding material, the succeeding material, the succeeding material, and the next succeeding material are as uniform as possible, and are appropriately set so that the following conditions are satisfied. To

Conveyance pitch between products a and b: T _A + t _B > t _A Conveyance pitch between products b and c: T _B −t _B > t _A Conveyance pitch between products c and d: T _B > t _A As described above, by adjusting the conveyance pitch according to the present invention, the conveyance pitches between products are adjusted to be as equal as possible and above the minimum limit value, so that conveyance failure such as transfer failure occurs. Will be resolved.

FIG. 3 shows the movement of the product in the state of FIG. 2 and the operating condition of the time meter in the conventional transportation method and the method of adjusting the transportation pitch according to the present invention, using charts of the detector and the time meter, respectively. It is a thing. In this way, according to the present invention, for example, when a portion with a small conveyance pitch occurs, the conveyance pitch between the preceding material and the succeeding material is lengthened, and the conveyance between the succeeding material and the succeeding material is further increased. The pitch can be shortened by that amount, and finally all the conveyance pitches can be adjusted so as to be over the limit value and close to the equal intervals, so that conveyance defects can be prevented.

Further, the present invention will be described with reference to examples, but this is an example of the present invention and the present invention is not limited thereto.

[0035]

EXAMPLE FIG. 4 is a chart showing a product transportation state detected by a detector 20 according to an example of the present invention. Lightweight H-section steel with a length of 8 m, 7.5 at a mill speed of 60 m / min
Books / minute (60m / minute / 8m), 8 seconds pitch (60 seconds / 7.5 books /
If a single piece is cut to a length of 5 m during continuous cutting for 5 minutes, the conveying pitch becomes 12 pieces / minute (60 m / minute / 5 m), and the conveying pitch at this time is only 5 seconds (60 seconds / 12 seconds). (Book / min)
Becomes shorter.

In this state, since the product of 5 m length is taken into the drawing device, the products of 8 m length lined up on the drawing device are locally dispensed in 5 seconds, and only that part is also in the subsequent transportation line. The product is conveyed at a conveyance pitch of 5 seconds. For this reason, when the one cycle time (equipment capacity) of the transfer device in the downstream process is 6.5 seconds, products with a 5-second pitch cannot be transferred (1.5 seconds is insufficient), and transport problems occur.

On the other hand, in the present invention, a detector is installed on the roller table line after passing through the drawing device and before the transfer device to configure the control system shown in FIG. Adjust the pitch. The limit minimum value t _A of the conveyance pitch is set to 6.5 seconds, and the stop time t of the table roller group is set.
_{Since B} is set to 1.5 seconds, the conveyance pitch is T _A (5 seconds) + t _B (1.5 seconds) even when a 5 second pitch product is conveyed.
= 6.5 seconds, one cycle time of the transfer machine can be increased to 6.5 seconds and smoothed.

[0038]

As described in detail above, according to the present invention,
It is possible to automatically detect a locally shortened transport pitch and automatically adjust to the set transport pitch. Therefore, it is possible to prevent the transfer failure in the transfer device due to the locally shortened conveyance pitch, and it is not necessary to reduce the mill speed in order to prevent trouble. For example, in the case of FIG. 4, in order to prevent trouble, 5 m × before cutting a 5 m long product.
(60m / min / 65sec = 9.2 lines / min) = The mill speed must be reduced to 46m / min.
It is also possible to increase the speed to m / min / 6.5 sec = 9.2 lines / min) = 73.6 m / min. Therefore, the production efficiency is improved.

When the transfer pitch shortening section is locally processed without reducing the efficiency of the mill, the capacity of the transfer device is improved.
(Cycle time reduction) can be achieved with minimum equipment cost. Especially, in the normal case, it is not necessary to modify the transfer device. In the example of FIG. 4, one cycle time of the transfer apparatus has to be increased to 5 seconds or less, but this apparatus makes it unnecessary. Work is easier because the mill speed decreases and rises less.

The minimum required equipment is a detector: 1 set, a time meter (AA 'product conveyance pitch setting): 2 pieces, a minimum pitch setting device (1 hour each in the time meter AA'): 2 units, stop time setting device (1 unit for each time meter A-A '): 2 units, very simple device configuration. Therefore, the number of device failures is small, and the reliability of detection and control is high. Since the passage of the product is detected only by the detector, an AC motor with low equipment cost can be used. The effect was obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of a control system when a method for adjusting a product conveyance pitch according to the present invention is applied to an actual conveyance line.

FIG. 2 (a) is an explanatory view conceptually showing the transfer situation of a conventional transfer line, and FIG. 2 (b) is a transfer line to which a product transfer pitch adjusting method according to the present invention is applied. FIG. 3 is an explanatory diagram conceptually showing the transportation status of FIG.

FIG. 3 is a graph showing the transportation status of the lightweight H-section steel in FIG. 2 (operating status of the detector and operating status of the time meter) for the conventional method and the method of the present invention.

FIG. 4 is a graph showing a transportation state of the lightweight H-section steel (operating state of the detector) when the method according to the present invention is applied.

FIG. 5 is a graph schematically showing an example of a current transportation facility for lightweight H-section steel, FIG. 5 (a) is an overall view, and FIG. 5 (b) is a drawing device of FIG. 5 (a). FIG.

FIG. 6 is an explanatory view showing a method proposed by Japanese Patent Publication No. 53-8307.

[Explanation of symbols]

 10: Welding machine 11: Cutting machine 12: Rejection device for defective short products 13: Drawer device 14: Transfer pitch detector installation location 15: Painting machine 16: Transfer device 17, 19: Detector 18: Product 20: Transfer pitch detection Devices 21, 22: Table roller parts 23, 24: Rolled materials 25, 26: Conveying rolls 27: Optical detectors 28: Converters 29, 30: Electric motors 31, 31 ': Control device 32: Addition calculators 33, 37 : Comparison circuit 34, 36: Gate circuit 35: Memory circuit

Claims (1)

[Claims] 1. A roller table line comprising at least two table roller groups, which are continuously arranged in series and each of which is constituted by a plurality of transport rollers driven by synchronous drive sources, is continuously provided in series to produce a product. A method of adjusting a conveyance pitch during conveyance, in which a conveyance pitch between continuously conveyed products is measured using a detector installed between two adjacent table roller groups, and the measured conveyance is performed. When the pitch is equal to or less than a preset conveyance pitch limit value, the conveyance rolls of the table roller group positioned adjacent to the upstream side of the detector are stopped and activated for a preset time. How to adjust the product conveyance pitch.