JPH101208A - Pitch feed control method for conveyor type carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To design and manufacture a facility suitable for the practical use of a carrier by making conveying pitch variable based on the operating condition of a device loading an object to be loaded on and a device unloading it against a conveyor type carrier and the loading condition of the object. SOLUTION: The operating condition of a loading device 20 loading an object 8 to be loaded onto a carrier 10 is judged. The loading device 20 judges the number of the objects 8 waiting for loading onto the carrier 10, and if the number of the waiting objects is over a fixed number, it judges necessity of quick conveying so as to quickly convey them. Next, the condition of the objects 8 on the conveyor is recognized, and the operating condition of an unloading device 22 unloading the objects from the conveyor is set as the number of objects on the conveyor, the objects 8 over the fixed number are prevented from being loaded on the conveyor, and conveyance of the conveyor over the capacity of the device is restrained. Hereby, it is designed so as to decrease facility capacity, and hence the construction cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the pitch feed of a conveyor-type transport device for transporting heavy objects such as coils almost continuously, and more particularly to a transport device suitable for use in a coil yard conveyor. The present invention relates to a method for controlling a pitch feed of a conveyor-type transportation device, which can reduce an excessively large specification portion of a loading capacity of a vehicle and reduce equipment costs.

[0002]

2. Description of the Related Art Generally, when a heavy object such as a coil is transported almost continuously using a conveyor-type transport device, the feed pitch of the transport device is controlled by the following method.

[0003] A method of moving one pitch at a time in conjunction with the pitch at which the load is placed on the transport equipment. A method in which the pitch is not synchronized with the pitch at which the load is placed on the transport equipment, but is moved one pitch at a time. In conjunction with the pitch at which the load is unloaded from the transport equipment,
How to move one pitch at a time.

[0004] According to such a conventional control method, when performing pitch feed control of a conveyor type transport device, a start command between related devices,
It may be controlled by a start command or the like after a certain period of time,
Very simple controls can be implemented.

[0005]

However, in such a conventional control method, a load such as a coil is simultaneously loaded on all of the load positions of the load specified on the equipment in the conveyor type transport equipment. Therefore, there is a problem that the drive system for the strength, motor output, hydraulic pressure, etc. of the equipment is set to be relatively large compared to the normal use, and the equipment cost is high. Was.

FIG. 1 is a front view for explaining a control concept of a conventional conveyor-type transport device (hereinafter, also simply referred to as a transport device) 10. In the figure, 12 is a stop position on the transport device 10 in response to a pitch feed command, 14 is a loadable position on the transport device 10, 20 is a crane for placing a load 8 such as a coil on the transport device 10. Loading equipment (hereinafter, simply referred to as loading equipment) such as 2
Reference numeral 2 denotes a load carrying device (hereinafter simply referred to as a "loading device"), such as a crane, for lowering the load 8 from the transport device 10.

Conventionally, as shown in FIG. 2, the loading device 20 loads the load 8 on the loadable position 14 (step 100) with respect to the transport device 10 on the conveyor, and even if it is moved by one pitch, the leading device is moved to the top. It is determined that the object does not fall (step 102), or the loading device 22 is in the loadable position 14
Each time the load 8 is unloaded from (step 110), it is advanced by one pitch (step 120).
The pitch feed was controlled. Note that the determination in step 102 is often made not by software but by guard by an electrical interlock.

In the case of FIG. 1, however, there are eight stop positions 12 for the pitch feed command and eight loadable positions 14 on the conveyor which can be simultaneously loaded. It is necessary to design the strength, power, and the like in consideration of all of the loadable positions 14 on the 10 conveyors, that is, a maximum of eight loadable positions simultaneously. In other words, it is necessary to design various facilities in consideration of the maximum number that can be physically loaded, and the ability to actually use it (according to the inventor's survey, about 40% of the maximum number that can be loaded).
There is a problem that it is necessary to design and manufacture equipment with significantly larger specifications than in the case.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to make it possible to design and manufacture facilities which are not excessive specifications but are suitable for actual use of transportation equipment. I do.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a method for controlling the pitch feed of a conveyor-type transport device for transporting heavy objects such as coils almost continuously. The above problem was solved by making the conveyance pitch of the load variable based on the operation status of the device that unloads the load from the conveyor-type transport device and the loading status of the load on the conveyor-type transport device. Things.

[0011] Further, the operation status of the equipment for loading the load is determined based on the number of the load in the waiting state.

Further, the operation status of the equipment for unloading the load is determined based on the number of loads to be unloaded from the transport equipment.

Further, the loading condition of the load on the transportation equipment is determined based on the possibility of collision or falling of the load.

According to the present invention, in a conveyor-type transport device for continuously transporting heavy objects such as coils, the transport pitch of the transport device is not controlled at a constant value, but the capacity of the transport device and the loading / unloading of the transport device. The transport pitch of the transport equipment is variably controlled in consideration of the operation status of the equipment to be loaded (waiting time of the load), the loading status of the transport equipment, and the like. The equipment can be designed and manufactured according to the actual usage conditions, not the specifications.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 3 is a flowchart showing an embodiment of a procedure for determining the pitch feed command output of the conveyor type transport equipment according to the present invention.

In this embodiment, first, at step 20
At 0, the operation status of the mounted equipment 20 such as a crane for mounting the load 8 such as a coil on the transport equipment 10 such as a conveyor is determined. Specifically, for example, it is necessary to determine the number of loads 8 that are currently waiting for the on-board device 20 to load on the transport device 10, and if there is a certain number or more of waiting, the urgent transportation is required. It is determined that there is
The feed by pitch is suppressed, and the feed is changed to n ± α pitch, so that the time required for loading and unloading of the load is shortened, and the load can be conveyed quickly. That is, in the target equipment of this embodiment, since the crane cannot place the coil on the conveyor unless the conveyor stops, each cycle time (time Ts for placing the coil on the conveyor, time T1 for moving the conveyor one pitch, and two pitches for the same pitch) The relationship between the moving time T2 and the moving time T3) for three pitches is as follows.

T1 <Ts <T2 <T3

Therefore, it is possible to increase the carrying capacity as a whole by moving the unit one pitch at a time and placing it on a crane.
In addition, if a single feed pitch is reduced and the conveyor is used as a buffer, it is less affected by rear equipment. For example, if there is a coil in the final position to be absolutely lowered, the conveyor cannot be moved until the coil is picked up.

Next, at step 210, the status of the load 8 on the conveyor is recognized. Specifically, for example, even if continuous conveyance is carried out one pitch at a time, whether the load 8 can be physically conveyed, in other words, even if the load 8 However, for example, it does not collide with the load at the entrance of the conveyor or fall down from the exit of the conveyor.

Next, at step 220, the operation status of the loading equipment 22 such as a crane for unloading the load from the conveyor is determined. Specifically, for example, considering the number of items waiting to be unloaded as the number of items to be loaded on the conveyor, the same determination as in step 200 is performed. Suppress the transport of a conveyor that exceeds its capacity. In other words, when the number of working steps of the loading equipment 22 to be used is large and the clogging is stopped, even if the next loaded article 8 is hurriedly held, the conveyor cannot be moved down any way.

Next, the process proceeds to step 230, where the above is comprehensively determined to determine whether or not operation is possible. If the result of the determination is negative, for example, if the load 8 is placed at the head position of the conveyor and cannot be moved until it is lowered, the conveyor is not moved.

On the other hand, if the result of the determination at step 230 is positive, at step 240 the optimum number of pitch feeds in the current operating state of each device is calculated, and at step 25
At 0, a command is actually output to the transport equipment 10.

In the example shown in FIG. 1, the number of entry / exit positions with respect to the conveyor is one. However, in practice, the present invention can be applied to a conveyor-type transportation device having a plurality of input / output facilities. It is.

[0025]

Next, an embodiment in which the present invention is applied to a coil yard will be described in detail.

FIG. 4 shows a coil yard to which the present embodiment is applied. In the figure, reference numeral 30 denotes a closed-loop track which is rolled by a hot strip mill (not shown), coiled by a coiler (not shown), and circulated by a coil mounted on a bogie (not shown). Is the orbit 30
The transfer machines (loading equipment) for transferring the coils circulating in a loop to the first conveyor 36 and the second conveyor 38, respectively, are the transfer machines 32, The first and second conveyors 46 for transporting the coils transferred from the first conveyor 34 to the first to fourth coil yards 41 to 44 use the coils located near the entrance of the first conveyor 36 as the second conveyor. Conveyors 51 to 54 for transporting near the entrance of the 38 are coil yards 41 to 4
4 overhead crane (loading equipment), 6
1 to 66 are coil cars provided in each place, 71 to 7
Reference numeral 6 denotes a coil car access skid (hereinafter, simply referred to as a coil skid) for accessing each coil car, 80 denotes an up ender, 82 denotes a coil car thereof, 84 denotes a down ender, and 86 denotes a coil car thereof.

In FIG. 4, the numbers on each conveyor indicate the stackable positions on the conveyor which are sequentially counted up toward the exit, with the entrance being 1, for example. The overhead crane 51 of the first coil yard 41 accesses the position of No. 5, The overhead crane 52 of the second coil yard 42 accesses the position of No. 15 and
o. The overhead crane 53 of the third coil yard 43 accesses the position of No. 16, The overhead crane 54 of the fourth coil yard 44 accesses the position 27.

In this embodiment, for example, the first conveyor 3
The number of operation pitches 6 is determined as follows according to the coil state of the conveyor and its peripheral equipment.

First, the loadable position N of the first conveyor 36
o. 5, when there is a coil to be transported in the first coil yard 41 (condition I is satisfied), whether there is a coil in all the corresponding parts of the transfer machine 32 and the loop 30 (condition 1a is satisfied), or , The overhead crane 52 of the second coil yard 42
Has failed (condition 2a is satisfied), the loadable position No. Change the destination of the coil on 5
The rescheduling of the feed pitch of the conveyor 36 is performed. On the other hand, when the above condition I is satisfied but the conditions 1a and 2a are not satisfied, the conveyance of the conveyor is stopped.

Next, the stackable position No. on the outermost side of the first conveyor 36 is determined. 18 has no coil (condition II is satisfied)
Loadable position No. on the entry side 1 has a coil (condition 1b)
Holds), the loadable position No. No. 15 has no coil for the coil skid 71 for the first conveyor 36 in the second coil yard 42 and the loadable position No. When there is no coil going to the first coil yard 41 in 5 (condition i is satisfied), the number of feed pitches of the first conveyor 36 is determined as follows.

That is, in the state where the conditions II, 1b, and i are satisfied, the number of coils of the transfer device 32 and the number of waiting coils of the corresponding portion on the track 30 are one or more, or
When the overhead cranes 52, 53 of the coil yards 42, 43 are abnormal or under inspection, the pitch cranes are advanced by one pitch.

On the other hand, when all of the following conditions a1 to e1 are satisfied, advance is made three pitches.

A1. Loading position No. 13, No. 1
4 does not have a coil directed to the coil skid 71. b1. Loading position No. 16, No. 17 has no coil. c1. At the loadable position No. 12, the coil skid 71
There is no outgoing coil, no coil on the coil car 61 for the first conveyor 36 in the second coil yard 42, or no coil on the coil skid 71. d1. Loading position No. 15 has no coil, or there is no coil on the coil car 62 for the first conveyor 36 of the third coil yard 43, or there is no coil on the coil skid 72 for the first conveyor 36 of the third coil yard 43. e1. Loading position No. 3, No. 4 does not have a coil going to the first coil yard 41.

On the other hand, when the conditions II, 1b, and i are satisfied, and when the following conditions a2 to f2 are all satisfied, the advance is made two pitches.

A2. There is no coil for the coil skid 71 at the loadable position No. 14. b2. Loading position No. 15 has no coil. c2. Loading position No. 13 shows the coil skid 7
There is no one-way coil, no coil on the coil car 61, or no coil on the coil skid 71. d2. Loading position No. 16 has no coil, or no coil on the coil car 62, or no coil on the coil skid 72. e2. Loading position No. 17 has no coil. f2. Loading position No. 4 does not have a coil going to the first coil yard 41.

On the other hand, when the above conditions II, 1b, and i are satisfied, but the conditions are not satisfied, it is determined that the pitch is advanced by one pitch.

The conditions II and 1b are satisfied,
If the condition i is not satisfied (corresponding to the condition ii), the transfer crane 32 and all the corresponding parts on the track 30 have coils, or the overhead crane 5 in the second coil yard 42
If the equipment failure is No. 2, the loadable position No. Fifteen
If the upper coil goes to the coil skid 71, the destination is changed and the feed pitch of the first conveyor 36 is rescheduled.

On the other hand, if the conditions II, 1b and ii are satisfied but the conditions are not satisfied, the pitch feed of the first conveyor 36 is stopped.

Although the condition II is satisfied, the loadable position No. 1 has no coil (condition 2b is satisfied), (i) the loadable position number. 2-No. If there is a coil at at least one point in any one of Nos. 17, it advances by one pitch, and (ii) stops otherwise.

The loading position No. In the case where there is a coil in 18 (condition III is satisfied), the pitch feed may cause the coil to fall, so the pitch feed of the first conveyor 36 is stopped until the coil is removed.

In the above description, the present invention has been applied to the coil yard, but the scope of the present invention is not particularly limited.

[0042]

According to the present invention, the number of loads simultaneously loaded on the conveyor is reduced, so that it is possible to reduce the facility capacity and design, and the construction cost can be reduced.

According to a study by the inventors, the loading ratio obtained by dividing the number of loads actually loaded at the loading position on the conveyor by the physical number of the conveyor has been designed as 1 in the past. According to the present invention, it is possible to set the value to 0.4 in accordance with the actual use state, and to reduce an excess specification portion of the loading capacity, thereby making it possible to reduce the equipment cost.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a conveyor-type transport facility to which the present invention is applied.

FIG. 2 is a flowchart showing a conventional pitch feed control method.

FIG. 3 is a flowchart showing an embodiment of a procedure for determining a feed pitch according to the present invention.

FIG. 4 is a plan view showing a coil yard to which an embodiment of the present invention is applied;

[Explanation of symbols]

 8 Loaded goods 10 Conveyor type transport equipment 12 Stop position 14 Loadable position 20 Loaded equipment 22 Loaded equipment 30 Tracks 34, 34 Transfer machines 36, 38, 48 Conveyor 41 -40: coil yard 51-54: overhead crane

Claims (4)

[Claims] A method of controlling a pitch feed of a conveyor-type transport device for transporting a heavy object such as a coil substantially continuously, comprising: an operation status of a device for loading a load on the conveyor-type transport device; A pitch feed control method for a conveyor-type transport device, wherein a transfer pitch of a load is variable based on an operation status of a device for unloading a product, a loading status of a load on a conveyor-type transport device, and the like. 2. The method according to claim 1, wherein the operation status of the equipment for loading the load is determined based on the number of loads in a waiting state for loading. 3. The method according to claim 1, wherein the operation status of the equipment for unloading the load is determined based on the number of loads to be unloaded from the transport equipment. 4. The method according to claim 1, wherein the loading status of the load on the transport device is determined based on the possibility of collision or fall of the load.