JPS61150914A - Pitch conveying control device - Google Patents

Abstract

PURPOSE:To enable a working function and a safe operation to be augmented by allowing the target position to be corrected if a difference between the remainder of displacement when the top of materials is detected, and a reference point for the end of a conveying operation, is found to exceed the allowable limit. CONSTITUTION:The top of materials 8 is detected by a sensor 6. The remainder of displacement LA is computed at the time when detected by the sensor 6 by subtracting a present position PP from the target position LP set by an automatic position controller. Then, the remainder of displacement is compared with a reference distance L8 which is to be moved until the center of materials arrives at a reference point for the end of conveying operation after the top of materials 8 has been detected by the material detecting sensor 6. And the difference resulted from the above comparison is found to exceed an allowable limit LR, the value where LB is added to the present position PP, is set up as a target value LP of the automatic position controller. This configuration enables a working function to be safely controlled.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention detects the cumulative pitch error of a pitch conveying device that sequentially conveys a plurality of materials at a constant pitch by automatic position control, and automatically corrects the conveying pitch. This invention relates to a pitch conveyance control device.

[Technical background of the invention and its problems] Conventionally, pitch conveying devices that convey materials at regular intervals have not been able to automatically correct cumulative errors in pitch feeding because the number of conveyed materials is small and high accuracy is not required. Not done.

Furthermore, if the conveyance pitch is not changed for a long period of time, a method is used in which the actual pitch is measured and the set value of the pitch is manually adjusted only when an error occurs in a certain direction.

However, as the machine becomes larger and the number of materials to be conveyed increases, the accumulated errors also increase, resulting in large deviations in the position of the material sent to the next process, and Is there not enough space to take in the material? I << (Which problem arises.

[Object of the Invention] The present invention provides pitch conveyance control that is safe and easy to work with, which automatically corrects the conveyance pitch when the cumulative pitch feed error exceeds a predetermined value, and controls the end stop position of the material within an allowable range. The purpose is to provide equipment.

[Summary of the Invention] The present invention provides a pitch conveyance control device that controls, via a position control device, the conveyance position of a pitch conveyance device that sequentially conveys a plurality of materials by repeating pitch conveyance at a predetermined pitch. A material detection sensor detects the position of the leading material a certain distance before the point, and the remaining distance of pitch transport at the time of material detection is screened, and if the difference between the remaining distance and the above fixed distance is less than the allowable value, pitch transport is started. It is equipped with a pitch correction function that changes the position target value in pitch conveyance to a value obtained by adding the above fixed distance to the current position when the tolerance value is exceeded without changing the position target value in . This system maintains the final stopping position of the conveyed material within a predetermined tolerance from the final reference stopping point to ensure safe and reliable transport of the material to the next process. The space after the end material is calculated, and if there is not enough space to take in the material, the subsequent material is prohibited from being taken in to prevent materials from colliding.

[Embodiments of the invention] An embodiment of the present invention is shown in FIG.

Fig. 1 shows a case in which steel sections are lined up in parallel and conveyed at a pitch, where 1 is a pitch conveying device that supports the material and conveys it at a constant pitch in the direction of the arrow, 2 is a drive motor, and 3 is a motor 2.
4 is a position detector that recognizes the amount of movement of the material based on the rotation angle of the motor 2; 5 is a position detector that determines how far the material should move based on the target position LP and the current position PP obtained from the position detector 4. 6 is a material detection sensor that detects that the leading edge of the material has arrived at the conveyance end point position. A taking-in device 8 takes in the next material in the direction of the arrow when a space is available, and 8 is a material that is conveyed at a constant pitch.

In addition, LA is the distance [B
As shown in FIG. 2, is the reference distance that the pitch conveying device 1 must move after the material detection sensor 6 detects the leading edge of the material 8 in order for the center of the material to arrive at the conveyance end point reference position.

Next, the operation shown in FIG. 1 will be explained with reference to the flowcharts shown in FIGS. 3 and 4.

Figure 3 is related to the stop position control of the leading material,
First, in step 1, when the material detection sensor 6 on the outlet side of the pitch conveying device 1 detects the leading end of the material 8, the process moves to step 2.

In step 2, the remaining movement ILA at the time of detection by the material detection sensor 6 is calculated by subtracting the current position It PP from the position target value LP of automatic position control.

Next, in step 3, A and LB are compared as described above, and if the absolute value of the difference exceeds the tolerance LR required for carrying out the material, proceed to step 4, and if it does not, proceed to step 1. return.

In step 4, the reference distance LB is added to the current position PP to set a new automatic position control target 1111LP, and the process continues the pitch operation and returns to step 1.

As a result, the leading material is sequentially stopped within the tolerance of the transport end point reference position.

Next, FIG. 4 is related to determining the space when taking the subsequent material into the pitch conveying device 1. First, step 1 is shown.
Initialize the cumulative movement amount PPs of the tail end material with
Reset the capture disable signal [k for 7 and move on to step 2.

In step 2, it is determined that the pitch conveyance device @1 has started pitch operation, and the process moves to step 3.

In step 3, the current position PP at the start of the pitch operation is stored as the current start position PP1, and the process moves to step 4.

In step 4, it is determined that the pitch conveying device 1 has stopped, and the process moves to step 5.

In step 5, the current position @PP1 at the time of starting is subtracted from the current position @PP at the moment of stopping and is added to the movement amount integrated value PPs.

If the cumulative movement value PP3 after addition is less than the required movement amount LF corresponding to the space for taking in the material, go to step 6, set the take-in impossible signal 1k to the take-in device 7, and take in the material. The work is put on standby, only pitch operation is performed, and the process returns to step 2.

If the above PPs is greater than or equal to the requested movement ff1LF, step 1
Return to and perform material intake and pitch operation.

The above operations eliminate large errors from the predetermined position to be sent to the next machine, and the material newly entering from the entry side is carried in without colliding with other materials, thereby achieving safe pitch conveyance.

[Effects of the Invention] As explained above, according to the present invention, the pitch is automatically corrected, eliminating a large error in the position of the material at the final end of the material conveying device, and adjusting the pitch to prevent the material from entering the entry side next. A pitch conveyance control device that is safe and highly workable is obtained, which prevents the material from colliding with the preceding material.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram showing an embodiment of the pitch conveyance control device according to the present invention, Fig. 2 is a detailed view of the material position on the exit side of the pitch conveyance device, and Fig. 3 is a flowchart showing the pitch correction operation in the present invention. , FIG. 4 is a flowchart showing the interlock operation of material intake in the present invention. 1... Pitch conveyance device 2... Drive motor 3... Drive device 4... Position detector 5... Position control device 6... Material detection sensor 7... Taking in device 8. ...Materials (7317) Agent Patent Attorney Noriyuki Chika (Idiot 1)
Figure 1 Figure 2 Figure 3 Figure R

Claims (2)

[Claims] (1) In a pitch conveyance control device that controls the conveyance position of a pitch conveyance device that sequentially conveys a plurality of materials by repeating pitch conveyance at a predetermined pitch through a position control device, a pitch conveyance control device that sequentially conveys multiple materials by repeating pitch conveyance at a predetermined pitch is used. A material detection sensor detects the position of the leading material, calculates the remaining distance of pitch transport at the time of material detection, and changes the position target value for pitch transport when the difference between the remaining distance and the above fixed distance is less than the allowable value. 1. A pitch conveyance control device comprising a pitch correction function that changes a position target value in pitch conveyance to a value obtained by adding the above-mentioned certain distance to the current position when the position value exceeds a tolerance value. (2) The pitch according to claim 1, which has an interlock function that integrates the transport distance of the tail end material and prohibits the subsequent material from being taken into the transport device when the integrated value is less than a predetermined value. Conveyance control device.