KR20110111929A - Control method for synchronized robotic transfer vehicle system using by relative speed and distance check device - Google Patents

Abstract

The present invention relates to a control method of a synchronized RTV system using a relative speed and distance detection device, the object of which is efficient operation and collision and collision accident through mutual cooperation in a synchronized RTV system operating by installing two RTVs on the same rail It is to provide a control method of a synchronized RTV system using a relative speed and distance detection device to improve the efficiency and safety of the device by preventing the system.
To this end, in the control method of the synchronizer RTV system using the relative speed and distance detection apparatus according to the present invention, the distance between the RTV in real time by operating the displacement sensor provided in each RTV running on the same rail A detection step; After calculating the relative speed in the speed distance control board based on the detected value from the distance detection step, calculate the deceleration distance corresponding to the moving distance from the start point of deceleration to the stop necessary for stopping the operation according to the speed. A deceleration distance calculation step; A deceleration signal transmission step of comparing the deceleration distance calculated in the deceleration distance calculation step with a current distance and transmitting a deceleration signal according to the deceleration distance to the main control board; And a deceleration determining step of determining whether to decelerate the RTV by comparing the self speed and the deceleration signal with each other in the main control board receiving the deceleration signal.

Description

CONTROL METHOD FOR SYNCHRONIZED ROBOTIC TRANSFER VEHICLE SYSTEM USING BY RELATIVE SPEED AND DISTANCE CHECK DEVICE}

The present invention relates to a method for controlling a synchronized RTV system using a relative speed and distance detection device. More specifically, the present invention relates to a synchronized RTV system in which two RTVs are installed and operated on the same rail in order to improve the capacity of a load. The present invention relates to a control method of a synchronized RTV system using a relative speed and distance detection device for efficient driving, collision, and collision accident through air conditioning.

      In general, a transfer device that is used in a variety of automatic warehouse entry and exit system is commonly called RTV (Robotic Transfer Vehicle) system, the RTV system is a reciprocating movement of the receiving line or entry and exit while the RTV reciprocating on a straight rail type The predetermined conveyed goods transported on the conveyor line are moved to a certain point and then transported through the conveyor of the delivery line or the input and output line.

      Here, in the case of the linear RTV system, the RTV system receives a destination command from a higher control PC, and one RTV plays a role of transferring or loading cargo.

      In other words, when processing the first instruction to transfer the first cargo from one station to another station and the second instruction to transfer the second cargo from another station to another station, the RTV Two commands are executed over 2Cycles by executing the first instruction for moving the first cargo and the second instruction for moving the second cargo in the order commanded from the upper control PC.

      However, the conventional RTV system as described above is not suitable for a site requiring a high volume of traffic, and in an automatic warehouse having a large number of entry / exit stations and a long operation distance, a high frequency of use causes a problem of RTV overload. .

      Accordingly, the present applicant, through the domestic patent application No. 2007-0071070 and the domestic utility model registration application No. 2008-0013373, added the anti-collision function and the synchronizer control technology to the transfer device of the linear RTV system to transfer two units on the same rail "Synchronize RTV system" that enables the devices to operate simultaneously, thereby enabling efficient entry / exit and picking operations, and a straight RTV with two RTVs on the same rail. It is an extended type of "cargo handling" that executes two cargo movement commands to one cycle to solve the throughput and overload of equipment, and to flexibly operate as synchronized RTV and linear RTV as needed through the control of upper PC. "Synchronized RTV System with Enhancement and Flexibility".

      In other words, a straight RTV in which one RTV is operated on one rail of the RTV type, a conveying device for moving cargo in an automated warehouse for automated logistics facilities, is inadequate for handling of a load, and the loop is configured to operate a plurality of rails by forming a loop as a loop. To apply the type RTV, the economics are inferior when the spatial aspect and the number of applied units are few.

Therefore, the RTV type that improves the disadvantages of the two types and optimizes space and installation cost as described above is a synchronized RTV system, which increases the efficiency of handling the volume of cargo by driving two RTVs on one rail.

On the other hand, in the synchronized RTV system as described above, since two transfer devices are operated simultaneously on the same rail, a control system is required to prevent the two transfer devices from colliding with each other. In the conventional synchronized RTV system, Efficient anti-collision control system has not been provided, there was a problem that the safety accident accordingly.

Accordingly, the present invention has been made to improve the conventional problems as described above, the present invention provides efficient operation and collision and collision accidents through mutual cooperation in a synchronized RTV system operating by installing two RTVs on the same rail The purpose of the present invention is to provide a control method of a synchronized RTV system using a relative speed and distance detection device, which can improve the efficiency and safety of the device.

      In order to achieve the above object, a method of controlling a synchronizing RTV system using a relative speed and distance detecting apparatus according to the present invention is that a displacement sensor provided in each RTV traveling on the same rail operates in real time. A distance detecting step of measuring a distance of the; After calculating the relative speed in the speed distance control board based on the detected value from the distance detection step, calculate the deceleration distance corresponding to the moving distance from the start point of deceleration to the stop necessary for stopping the operation according to the speed. A deceleration distance calculation step; A deceleration signal transmission step of comparing the deceleration distance calculated in the deceleration distance calculation step with a current distance and transmitting a deceleration signal according to the deceleration distance to the main control board; And a deceleration determining step of determining whether to decelerate the RTV by comparing the self speed and the deceleration signal with each other in the main control board receiving the deceleration signal.

      Preferably, in the distance detection step, the displacement sensor is characterized in that for transmitting the detected distance information to the speed distance control board at intervals of 50 [msec].

Also, preferably, the deceleration distance calculation in the deceleration distance calculation step is performed by changing the speed in the form of 'S' so as to provide a predetermined deceleration acceleration at the current relative speed and smoothness at the start and arrival of the RTV. It is characterized by obtaining by applying the S-curve applied value.

      According to the present invention made as described above, by configuring a pair of transfer devices in a linear RTV system to operate two RTVs on the same rail at the same time, more than 150% of the traffic volume compared to the existing RTV system in the same installation space The treatment effect can be obtained.

In addition, efficient operation, collision and collision accidents can be prevented in advance in the Synchronized RTV system, and the efficiency and safety of the device can be improved, and the relative speed can be directly detected for control. By doing so, there is also an effect of providing a higher performance system in which delay caused by wireless communication is also suppressed.

1 is a view schematically showing a configuration of a synchronized RTV system to which a control method of a synchronized RTV system using a relative speed and distance detection apparatus according to the present invention is applied;
2A and 2B are plan views illustrating the configuration of the RTV unit 1 and the RTV unit 2 of the synchronizer RTV system to which the control method of the synchronizer RTV system using the relative speed and distance detection apparatus according to the present invention is applied;
3 is a flowchart illustrating a control method of a synchronized RTV system using a relative speed and distance detection apparatus according to the present invention;
Figure 4 is a graph showing that the deceleration distance is calculated through the deceleration acceleration and the S-curve applied value in the control method of the synchronized RTV system using the relative speed and distance detection apparatus according to the present invention.

      Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

      1 is a view schematically showing the configuration of a synchronized RTV system to which the control method of a synchronized RTV system using a relative speed and distance detection apparatus according to the present invention, Figures 2a and 2b is a relative speed and distance detection according to the present invention It is a top view which shows the structure of RTV unit 1 and RTV unit 2 of the synchronizing RTV system to which the control method of the synchronizing RTV system using a apparatus is applied.

      In the synchronizer RTV system to which the control method of the synchronizer RTV system using the relative speed and distance detection apparatus according to the present invention is applied, a pair of RTVs 210 and 220 exist on the same rail 100, so that the control is not only for general purposes. Operation control considering the direction, speed and mutual distance of mutual operation should be made.

      To this end, the synchronizing RTV system has a displacement sensor for measuring the distance between the RTV, a control board for receiving the distance information from the displacement sensor to calculate and control the relative speed and the deceleration distance according to the speed is added. It is provided so that collision or collision is prevented.

      That is, the synchronizer RTV system is provided with two RTVs consisting of the first unit 210 and the second unit 220 on the straight rail 100.

      The two RTVs composed of the first unit 210 and the second unit 220 simultaneously process two cargo movement commands to one cycle under the control of an upper control PC (not shown). At this time, each of the RTV consisting of the first unit 210 and the second unit 220, a plurality of sensors (211a, 221a: cargo departure detection sensor) to detect the state of the load, the deceleration, departure, etc. 211b and 221b: cargo detection sensor, 211c and 221c: cargo detection sensor, 211d and 221d: cargo reduction sensor), and sensor transmitters 212 and 222 connected to the plurality of sensors are provided to detect a predetermined detection signal from the sensors. The RTVs 210 and 220 are also transmitted to the upper control PC, and each of the RTVs 210 and 220 is also provided with remote control receivers 213 and 223 for receiving a remote control signal and 7-segment displays 214 and 224 for displaying predetermined information.

      In addition, displacement units 216 and 226 for measuring the distance between the RTVs at positions facing each other of the RTVs in the state in which the first unit 210 and the second unit 220 of the RTV are arranged side by side on the straight rail 10. And anti-collision sensors 215 and 225 for preventing a collision between each other, while emergency switches 217 and 227 are formed at each corner point of each RTV, and four emergency switches are provided on each RTV.

      In addition, each RTV includes a speed distance control board 231 and a speed distance control board 231 for generating a deceleration signal after calculating a relative speed and a deceleration distance based on detection values from the displacement sensors 216 and 226. After receiving the deceleration signal and comparing the own speed and the deceleration signal is provided with a main control board 230 to determine whether the deceleration of the RTV.

Reference numerals 232, 233 and 234 denote RTV CONTROL BOX ASSY, RTV CONTROLLER UNIT ASSY and DC REACTOR, respectively.

Next, the operation of the present invention made as described above will be described in detail with reference to FIGS. 1 to 4.

The control method of the synchronizer RTV system using the relative speed and distance detection apparatus according to the present invention includes a distance detection step (steps 310 and 312), a deceleration distance calculation step (steps 320 and 322), a deceleration signal transmission step (steps 324 and 326), and a deceleration. Control is made, including a determination step (steps 330 and 332).

First, in the distance detecting step, the displacement sensors 216 and 226 provided in each of the RTVs 210 and 220 currently running on the rail 100 having a linear shape are operated (step 310), and the pair of RTVs are executed in real time. (210,220) The relative distance between each other is measured and transmitted to the speed distance control board 231 (step 312).

In this case, the respective displacement sensors 216 and 226 transmit the detected relative distance information to the speed distance control board 231 at intervals of 50 [msec].

Thereafter, the speed distance control board 231 that receives the relative distance detection value between the pair of RTVs 210 and 220 through the distance detection step calculates the relative speed based on the relative distance detection value (step 320). In accordance with the speed, the RTV calculates the deceleration distance corresponding to the moving distance from the start of deceleration to the stop necessary for the operation stop (step 322).

At this time, the speed distance control board 231 calculates the deceleration distance by applying a predetermined deceleration acceleration and the S curve applied value at the current relative speed.

That is, referring to FIG. 4, when the two RTVs are driven on the same rail, the deceleration distance at the current relative speed is calculated during normal operation to avoid collisions or collisions between the RTVs. The required deceleration start point is determined by comparing the distance with the actual distance of the current RTV. As the determinants of the 'deceleration distance', the speed, 'S curve applied value' and 'deceleration acceleration' are used.

Here, the 'S curve applied value' is a technique of gently changing the speed in the S-shape in order to provide a softness at the start and arrival of RTV, causing a time delay depending on the applied value, This affects the deceleration distance. If the value is large, the deceleration time becomes longer and the deceleration distance increases.

In addition, the 'deceleration acceleration' is a value representing the change of speed with respect to time during deceleration. If this value is large, the deceleration time is shortened and the deceleration distance is reduced.

The value is determined to an optimal state in consideration of the traveling speed of the RTV, the capacity of the motor, the weight of the load, the type of load and the loading state.

Then, after calculating the deceleration distance through the step 322, the speed distance control board 231 adds the minimum safety clearance between the RTV to the calculated deceleration distance, the deceleration distance and the current including the safety clearance Comparing the distance between the two to transmit the deceleration command to the main control board 231 (step 324, step 326).

Thus, the main control board 230 receives the deceleration signal from the speed distance control board 231 by comparing the information on its own operation speed and the received relative speed information through the encoder to recognize the relative speed ( In step 330, it is determined whether to decelerate the corresponding RTVs 210 and 220 (step 332).

      Therefore, a pair of RTVs running on the same rails provide high throughput throughput, as well as efficient operation and collision and collision prevention through mutual cooperation, thereby greatly improving the efficiency and safety of the device. will be.

On the other hand, even if the modified embodiments different from the contents described in the present invention should not be individually understood from the technical spirit or prospects of the present invention, of course, it will fall within the claims attached to the present invention.

Explanation of symbols on the main parts of the drawings
310,312: distance detection step,
320,322: deceleration distance calculation step,
324,326: deceleration signal transmission step,
330,332: Decide whether to decelerate.

Claims (3)

A distance detection step of measuring a distance between RTVs in real time by operating a displacement sensor provided in each RTV traveling on the same rail;
After calculating the relative speed in the speed distance control board based on the detected value from the distance detection step, calculate the deceleration distance corresponding to the moving distance from the start point of deceleration to the stop necessary for stopping the operation according to the speed. A deceleration distance calculation step;
A deceleration signal transmission step of comparing the deceleration distance calculated in the deceleration distance calculation step with a current distance and transmitting a deceleration signal according to the deceleration distance to the main control board;
And a deceleration determination step of determining whether to decelerate the RTV by comparing the self speed and the deceleration signal with each other in the main control board receiving the deceleration signal. Control method of the system. The method of claim 1,
And the displacement sensor in the distance detection step transmits the detected distance information to the speed distance control board at intervals of 50 [msec]. The method of claim 1,
The deceleration distance calculation in the deceleration distance calculation step is a S-curve that gently changes the speed change in the form of 'S' so as to provide a predetermined deceleration acceleration at the current relative speed and smoothness at the start and arrival of the RTV. A control method of a synchronized RTV system using a relative speed and distance detection device, characterized in that obtained by applying the applied value.

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