JP2008143676A - Control device of transport device and transport device with it and control method of transport device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve productivity of a facility while preventing damage of a transport device. <P>SOLUTION: The control device 10 of a conveyor 1 is provided with a monitor unit 20 and a drive switching part 31 attained by a sequencer 30. The monitor unit 20 detects a loaded state of a driving motor M1 and judges the loaded state of the driving motor M1 based on the detected loaded state. The drive switch part 31 switches between a normal side action and a reverse side action by the driving motor M1 depending on the judgement result of the monitor unit 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a control device used in a transport device such as a conveyor, a transport device including the control device, and a control method of the transport device.

  Generally, a conveyor is used for conveying granular materials such as powder. This type of conveyor mainly includes a casing, a chain rotatably supported by the casing, a plurality of flights (conveying members) fixed to the chain, and a drive motor that drives the chain. The flight has a conveyance surface for scraping off the conveyance object. When the chain is rotationally driven by a drive motor or the like, the flight fixed to the chain moves along the casing. Thereby, a conveyed product is pushed by a flight and is conveyed.

  However, if the transported product is mixed with a different property (hereinafter referred to as foreign material) than expected, or if the supply amount to the conveyor is temporarily excessive, the load on the drive motor will increase. The drive motor and other parts may be damaged.

Therefore, a conventional conveyor employs a protection device that forcibly stops the conveyor when the load on the drive motor increases. This type of protection device monitors the load of the drive motor by, for example, a current value. When the current value of the drive motor exceeds a predetermined value due to foreign matter biting or the like, the conveyor is stopped by the protective device (see, for example, Patent Document 1).
JP 59-69309 A

  When the conveyor is stopped by the protective device, for example, an operator who has rushed to the site restarts the conveyor manually. At this time, taking into consideration that the foreign matter is caught, the conveyor is slightly reversed to release the foreign matter. Further, when the supply amount is excessive, restarting is performed by inching that slightly operates the conveyor by utilizing the fact that the starting torque of the conveyor is large.

  However, if the conveyor stops frequently, the burden on the worker is significantly increased and the total operation time of the conveyor is shortened.

  In addition, a certain amount of time is required until the worker arrives around the conveyor after the conveyor stops. For this reason, in some cases, the conveyor stop time becomes longer than necessary, and the conveyed product accumulates in the upstream equipment. In this case, when the operation of the conveyor is resumed, the amount of the conveyed product to be supplied temporarily becomes excessive, and the conveyance state becomes unstable. In some cases, stopping due to conveyor overload is facilitated.

  On the other hand, when the conveyor stops due to the biting of foreign matter, there are many minor things that do not require the conveyor to be stopped. Up to such a case, it is not preferable that the burden on the worker increases or the conveyance state becomes unstable. In order to reduce the number of times the conveyor is stopped, it is conceivable to increase the set value of the protection device. However, it is not preferable to increase the set value of the protection device in consideration of damage to the conveyor.

  Thus, there is a need for a transport device that can improve the productivity of a facility while preventing damage to the transport device such as a conveyor.

  The subject of this invention is providing the control apparatus which can aim at the improvement of productivity of a facility, preventing the failure | damage of a conveying apparatus, the conveying apparatus provided with the same, and the control method of a conveying apparatus.

  A control device according to a first aspect of the present invention includes a casing in which a conveyed product is supplied, a plurality of conveying members movable with respect to the casing, a connecting member that connects the conveying members, and a conveying member via the connecting members. And a drive unit that can be driven in the forward and reverse directions in the transport direction. The control device includes a load detection unit, a load determination unit, and a drive switching unit. The load detection unit detects a load state of the drive unit. The load determination unit determines the load state of the drive unit based on the load state detected by the load detection unit. The drive switching unit causes the drive unit to switch between the forward side operation corresponding to the forward direction in the transport direction and the reverse side operation corresponding to the reverse side in the transport direction according to the determination result of the load determination unit.

  In this control device, switching between the forward side operation and the reverse side operation of the transport device is performed by the drive switching unit according to the load state of the drive unit. For this reason, for example, when the drive unit drives the transport member to the positive side in the transport direction, even if the load on the drive unit increases due to the biting of foreign matter, the drive switching unit switches to the reverse operation. As a result, the conveying member is driven to the opposite side in the conveying direction, and the foreign object is easily released. As described above, in this control device, the operation can be automatically switched according to the load state, so that the foreign matter can be automatically released and the number of times of stopping due to overload is reduced. For this reason, the productivity of the facility can be improved while preventing breakage of the transfer device.

  A control device according to a second invention is the control device according to the first invention, wherein the load determination unit has reached a set load state in which the load state is set in advance, or the load state has exceeded the set load state. It is determined. The drive switching unit causes the drive unit to perform a reverse side switching operation from the normal side operation to the reverse side operation based on the determination result of the load determination unit, and a preset set operation time elapses after the reverse side switching operation. After that, the drive unit is caused to perform the forward side switching operation from the reverse side operation to the forward side operation.

  A control device according to a third aspect of the present invention is the control device according to the second aspect of the present invention, further comprising a number-of-times measurement unit, a first number of times determination unit, and a stop unit. The frequency measurement unit measures the number of times the load determination unit determines that the load is overloaded. The first number determination unit determines that the number of times of measurement in the number of times measurement unit has reached a preset first number of times or that the number of times of measurement has exceeded the first set number of times. The stop unit stops the operation of the drive unit based on the determination result of the number determination unit.

  In the control device according to the fourth invention, in the control device according to the third invention, the drive unit is performing the switching operation at least after the reverse side switching operation is started until the normal side switching operation is completed. An alarm unit for issuing an alarm indicating the above is further provided.

  A control device according to a fifth aspect of the present invention is the control device according to the third or fourth aspect of the present invention, wherein the load determination unit is from the completion of the positive side switching operation until the preset set stabilization time elapses. Stops the determination of the load state. The control device further includes an interval time measurement unit and an interval time determination unit. The interval time measurement unit measures the time from when the load determination unit starts determination after the set stabilization time has elapsed until the determination result of the load determination unit is obtained. The interval time determination unit determines that the measurement time in the interval time measurement unit has reached a set interval time set in advance, or that the measurement time has exceeded the set interval time. The frequency measurement unit resets the measurement frequency based on the determination result of the interval time determination unit.

  A control device according to a sixth invention is the control device according to the third or fourth invention, further comprising an interval time measurement unit and an interval time determination unit. The interval time measurement unit measures the time from the completion of the positive side switching operation of the drive switching unit until the determination result of the load determination unit is obtained. The interval time determination unit determines that the measurement time in the interval time measurement unit has reached a set interval time set in advance, or that the measurement time has exceeded the set interval time. The frequency measurement unit resets the measurement frequency based on the determination result of the interval time determination unit.

  A control device according to a seventh invention is the control device according to the fifth or sixth invention, further comprising a second number of times determination unit and an upstream device control unit. The second number determination unit determines that the number of times of measurement has reached a preset second number of times or that the number of times of measurement has exceeded the second set number of times. The upstream device control unit transmits a stop command to the upstream device of the transport device or transmits a command to reduce the transport amount to the upstream device based on the determination result of the second number determination unit.

  A transfer device according to an eighth invention includes a casing, a transfer member, a connecting member, a drive unit, and a control device according to any one of the first to seventh inventions that controls the operation of the drive unit. ing. The casing is supplied with the conveyed product. The conveying member is movable with respect to the casing. The connecting member connects the conveying member. The drive unit can drive the transport member to the forward and reverse sides in the transport direction via the connecting member.

  Since this transport device includes the control device according to any one of the first to seventh inventions, even if foreign matter is mixed in the transported object or the supply amount becomes excessive, the transport device stops due to overload. The number of operations is reduced and the productivity of the facility is improved.

  A control method according to a ninth aspect of the invention includes a casing in which a conveyed product is supplied, a plurality of conveying members movable with respect to the casing, a connecting member that connects the conveying members, and a conveying member via the connecting members. And a drive unit that can be driven in the forward direction and the reverse direction in the transport direction. This control method includes a detection step, a determination step, and a switching step. In the detection step, the load state of the drive unit is detected. In the determination step, the load state of the drive unit is determined based on the load state detected in the detection step. In the determination step, the load state of the drive unit is determined. In the switching step, switching between the forward side operation corresponding to the transport direction forward side and the reverse side operation corresponding to the transport direction reverse side is performed in the drive unit according to the determination result of the monitoring step.

  As a result, the time during which the transfer device is stopped due to overload is reduced, and the productivity of the facility is improved.

  In the control device, the transport device including the control device, and the control method thereof according to the present invention, the above configuration reduces the time during which the vehicle is stopped due to overload even if foreign matter is mixed in or the supply amount is excessive. , Improve the productivity of the facility.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(1) Basic configuration of conveyor A conveyor 1 according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic configuration diagram of the conveyor 1, and FIG. 2 is a sectional view of the conveyor 1. The right side of FIG. 2 is the transport direction forward side of the conveyor 1, and the left side of FIG. FIG. 2 shows only a cross-sectional view on the feed side of the conveyor 1, and a cross-sectional view on the return side of the conveyor 1 is omitted.

  As shown in FIGS. 1 and 2, the conveyor 1 is a device that sequentially conveys the conveyed product 6 in a certain direction. Mainly, the conveyor body 2, a drive motor M <b> 1 that drives the conveyor body, and a drive motor M <b> 1. And a control device 10 for controlling the operation of the above.

  The conveyor main body 2 includes a casing 5 into which a conveyed product 6 is supplied, a plurality of flights 4 arranged so as to be movable with respect to the casing 5, a pair of chains 3 that connect the flights 4, and a chain 3. Via the drive motor M1 that can drive the flight 4 forward and backward, and a control device 10 that controls the operation of the drive motor M1. For example, the foreign material 7 is mixed in the conveyed product 6.

  The chain 3 is, for example, a roller chain on which a plurality of rollers (not shown) are rotatably mounted. The chain 3 is supported and guided by a rail (not shown) fixed to the bottom plate 9 of the casing 5. The chain 3 is rotatably supported by a sprocket (not shown) fixed to a shaft (not shown) provided rotatably with respect to the casing 5. A plurality of flights 4 are fixed to the chain 3. A drive motor M1 is mechanically connected to the shaft, and torque can be input from the drive motor M1 to the shaft.

(2) Configuration of Control Device The conveyor 1 has a retry function that automatically attempts to cancel the overload state when an overload occurs. This retry function is realized by the control device 10. The control device 10 controls the operation (forward rotation, reverse rotation) and stop of the drive motor M1 according to the load state of the drive motor M1. Specifically, as shown in FIG. 1, the control device 10 mainly includes a monitoring unit 20 that monitors the load state of the drive motor M1, and a sequencer that controls the operation of the drive motor M1 according to the load state of the drive motor M1. 30.

  The monitoring unit 20 detects the current value A of the drive motor M1, and determines whether or not the current value A has reached a preset current value A1. For example, the set current value A <b> 1 is set to a value that is about 1.2 to 1.3 times the current value A during normal load handling of the conveyor 1. When the current value A becomes equal to or greater than the set current value A1 (more specifically, when the state where the current value A is equal to or greater than the set current value A1 is continued for a certain period of time), the monitoring unit 20 The load is determined and the determination result is output to the sequencer 30. Thereby, the load state of the drive motor M1 can be monitored.

  Note that the starting current value of the driving motor M1 is not stable until a certain time has elapsed since the starting of the driving motor M1. For this reason, the monitoring unit 20 sets the determination function to the OFF state until the preset stabilization time TC elapses after the drive motor M1 is activated.

  The sequencer 30 switches between the forward side operation and the reverse side operation of the drive motor M <b> 1 based on the determination result of the monitoring unit 20. The sequencer 30 is equipped with a CPU 41, a ROM 42, a RAM 43, and the like, and various functions are realized by reading a program stored in the ROM 42 into the CPU 41. The sequencer 30 can be accessed from the outside by a loader and a PC (not shown), and can change programs and setting values via the loader and the PC.

  The program stored in the sequencer 30 includes a drive switching unit 31, a number measurement unit 32, a number determination unit 33, an interval time measurement unit 34, an interval time determination unit 35, a stop unit 36, and an alarm unit 37. And an upstream device control unit 38.

  The drive switching unit 31 appropriately checks the determination result from the monitoring unit 20 in order to automatically release the foreign object, and switches the rotation direction of the drive motor M1 when it is determined that the load is high. Specifically, after recognizing the determination result in the monitoring unit 20, the drive switching unit 31 switches the forward rotation operation of the drive motor M1 to the reverse rotation operation (reverse rotation switching operation). After a preset set operation time TA has elapsed since the completion of the reverse rotation switching operation, the drive switching unit 31 switches the reverse rotation operation of the drive motor M1 to the normal rotation operation (forward rotation switching operation).

  The number measurement unit 32 measures the number of times that the operation of the drive motor M1 has been switched due to an overload in order to prevent the retry by the drive switching unit 31 from being repeated more than necessary. Specifically, for example, the number measurement unit 32 measures the number of times that the monitoring unit 20 determines that the load is overloaded. The number determination unit 33 determines whether or not the number N measured by the number measurement unit 32 has reached a preset first set number N1, and stores the first determination result. Further, the number determination unit 33 determines whether or not the number N has reached a preset second set number N2, and stores the second determination result. For example, the first set number N1 is set to 2 and the second set number N2 is set to 1.

  The stop unit 36 stops the drive motor M1 based on the first determination result, and stops the retry operation of the drive switching unit 31. The warning unit 37 outputs a signal indicating that the conveyor 1 has stopped due to overload to the outside based on the first determination result. By this alarm signal, for example, an alarm display lamp provided on a local operation panel (not shown) is turned on, and the stop of the conveyor 1 is notified to the surroundings. When a central control system (not shown) capable of communicating with the sequencer 30 is provided, the central control system displays an alarm indicating that the conveyor 1 has stopped due to an overload when the alarm signal is received. .

  The alarm unit 37 outputs a retry display signal indicating that the drive motor M1 is performing a switching operation in order to notify the worker that the conveyor 1 is performing a retry operation. Specifically, the alarm unit 37 outputs a retry signal from the start of the reverse side switching operation to the completion of the positive side switching operation. By this retry signal, for example, a retry display lamp is lit on the on-site operation panel, and the central control system displays on the display that the conveyor 1 is retrying. Thereby, an operator can grasp | ascertain easily the overload state of the conveyor 1, and it becomes possible to prepare for the stop by overload.

  The upstream device control unit 38 reduces the transport amount of the upstream conveyor 101 based on the determination result of the frequency determination unit 33 in order to reflect the result of the overload determination in the monitoring unit 20 in the operation of the upstream device. A signal to that effect is transmitted to the control device 110 of the upstream conveyor 101. When the upstream conveyor 101 has a function capable of arbitrarily adjusting the transport amount, the control device 110 reduces the transport amount of the upstream conveyor 101 and the load on the conveyor 1 is reduced. When the upstream conveyor 101 does not have such a function, a stop signal is transmitted to the control device 110 of the upstream conveyor 101. For example, the control device 110 stops the drive motor M2 for a predetermined time.

  In order to determine whether the overload detected by the monitoring unit 20 is due to the same factor or a different factor, the interval time measuring unit 34, after the reverse side switching operation of the drive switching unit 31 is completed, The interval time T2 is measured until the determination result of the monitoring unit 20 is obtained. The interval time determination unit 35 determines whether or not the time T2 measured by the interval time measurement unit 34 has reached a preset interval time TB. When the time T2 reaches the set interval time TB, it can be determined that the previous overload state and the next overload state are caused by different factors. For this reason, the above-mentioned number measuring unit 32 resets the number N of retry operations to zero when the time T2 reaches the set interval time TB by the interval time determining unit 35.

  With the above configuration, the forward side operation and the reverse side operation of the conveyor 1 are automatically switched according to the current value A of the drive motor M1, and the retry function of the conveyor 1 is realized. When the overload state is not improved by the retry function, the drive motor M1 stops and the conveyor 1 stops.

(3) Operation of Conveyor The operation of the conveyor 1 will be described with reference to FIGS. 3 and 4 show an operation flow chart of the conveyor 1 and FIG. 5 shows an operation timing chart of the conveyor 1. 5A, when the interval time T2 is longer than the set interval time TB and the number of times N is reset halfway and the operation of the conveyor 1 is continued, FIG. 5B shows that the time interval T2 is longer than the set interval time TB. This shows a case where the conveyor 1 is finally stopped due to an overload.

a) During steady operation When the conveyor 1 is in operation, power is supplied to the drive motor M1, and the drive motor M1 is rotating forward. In this case, the chain 3 is rotationally driven by the drive motor M1, and the flight 4 is driven to the positive side in the transport direction. In the casing 5, the conveyed product 6 is sequentially supplied from the upstream conveyor 101, and the conveyed product 6 is scraped off by the flight 4 and conveyed to the positive side in the conveying direction.

  As shown in FIG. 3, during the operation of the conveyor 1, the monitoring unit 20 detects the current value A and determines whether the current value A is equal to or greater than the set current value A1 (S1). Although the current value A indicating the load state of the drive motor M1 varies slightly depending on the supply amount of the conveyed product 6 and the frictional resistance, the variation of the supply amount of the conveyed product 6 is small and no foreign matter is caught. In the case (or when the foreign matter is very slightly bitten), the current value A changes in a substantially constant state within a range less than the set current value A1. Therefore, the monitoring unit 20 determines that the current value A is less than the set current value A1 (S1). At this time, in order to determine how much time has elapsed since the previous overload state, it is determined whether or not the interval time T2 in the interval time measuring unit 34 is equal to or greater than the set interval time TB (S2). . When the interval time T2 is less than the set interval time TB, it is considered that the previous overload state is likely to be related to the next overload state. For this reason, step S1 is repeated without resetting the number of times of measurement N (S2, FIG. 5B). On the other hand, when the interval time T2 is equal to or longer than the set interval time TB, a long time has elapsed since the previous overload state, and the previous overload state is considered to be improved once. For this reason, the number N of measurements up to the previous time in the number counting unit 32 is reset to zero (S2, S3, FIG. 5A).

  As described above, in steps S1 to S3, the load state of the conveyor 1 is monitored, and the interval time T2 from the previous overload state is monitored.

b) Overload state During operation of the conveyor 1, for example, as shown in FIG. 6, for example, when a foreign object 7 is caught between the flight 4 and the bottom plate 9, the friction resistance increases, so the current value of the drive motor M <b> 1 A increases. If this state is continued, it is determined by the monitoring unit 20 that the current value A has become equal to or greater than the set current value A1 for a predetermined time, and it is determined that the conveyor 1 is in an overload state (S1). At this time, first, the number determination unit 33 determines whether or not the number of times N measured by the number measuring unit 32 has reached a preset retry number NA (S4). When the number of times N has reached the retry limit number NA (in the case of N = 2 = NA in FIG. 5B), the overload state is not improved even if the retry operation is repeated further (for example, for example, It is thought that the biting of foreign matter is not released). Therefore, a first determination result indicating that the number N has reached the retry limit number NA is stored in the number determination unit 33. When the first determination result is recognized by the stop unit 36, the drive motor M1 is stopped by the stop unit 36 (S5, FIG. 5B). When the first determination result is recognized by the alarm unit 37, the alarm display lamp is turned on by the alarm unit 37, and the stop due to the overload of the conveyor 1 is notified to the surroundings (S6, FIG. 5B). In this case, a recovery operation such as a foreign matter removal operation is performed by a worker rushing to the site.

  On the other hand, when the number N does not reach the retry limit number NA, the number N is further counted (S7, FIG. 5 (a), FIG. 5 (b)), and the retry operation is being performed in the local operation panel or the central control system. An alarm to the effect is notified by the alarm unit 37 (S8). Thereafter, the drive switching unit 31 performs a switching operation of the drive motor M1 as a retry operation. Specifically, the drive switching unit 31 stops and reversely rotates the drive motor M1 (S9), and the measurement of the operation time T1 is started (S10, FIGS. 5A and 5B). The reverse rotation operation is continued until the operation time T1 reaches the set operation time TA (S11, FIG. 5A, FIG. 5B), and when the time T2 reaches the set operation time TA, the drive switching unit 31 The drive motor M1 is stopped and rotated forward (S11, S12, FIGS. 5A and 5B). At this time, since the retry operation is completed, the display during the retry operation is canceled (S13).

  Thereafter, the measurement of the stable time T3 is started by the monitoring unit 20 (S14). When the stable time T3 reaches the set stable time TC, the interval time measuring unit 34 starts measuring the interval time T2 (S15, S16). .

  After that, the number determination unit 33 determines whether or not the number N has reached the set number NB (S17), and the determination result is stored in the number determination unit 33. When the number of times N has reached the set number of times NB, it is considered necessary to temporarily reduce the supply amount from the upstream conveyor 101. Therefore, when the upstream device control unit 38 recognizes the determination result, the upstream device control unit 38 transmits a signal indicating that the transport amount of the upstream conveyor 101 is decreased by a predetermined time to the control device 110 (S18). ). When the upstream conveyor 101 is in a format in which the transport amount can be arbitrarily adjusted, the transport amount of the upstream conveyor 101 can be temporarily reduced using the number of retry operations. Thereby, the load of the conveyor 1 becomes temporarily low and the frequency | count of a stop of the conveyor 1 reduces more.

  When these steps are completed, the monitoring unit 20 again monitors the current value A, and the above steps are repeated (S1).

(4) Operation and Effect As described above, in this conveyor 1, even if the driving motor M1 is overloaded by the control device 10 due to foreign matter being caught, before the conveyor 1 is completely stopped, Forward rotation and reverse rotation are automatically repeated. For this reason, for example, when the biting of the foreign matter is relatively light, the retrying function automatically releases the biting of the foreign matter without stopping the conveyor 1. Thereby, the frequency | count of the stop of the conveyor 1 by overload reduces, and it becomes possible to aim at the improvement of productivity of a facility, preventing the failure | damage of the conveyor 1. FIG.

  In addition, it is determined using the interval time T2 whether or not there is a relationship between two consecutive overload conditions. For this reason, compared with the case where there is no such a function, the frequency | count of the stop of the conveyor 1 further reduces and it becomes possible to improve the productivity of a plant | facility more.

  Furthermore, since various set values can be arbitrarily changed, the retry function can be tuned according to the properties of the conveyed product 6 and the type of the conveyor 1.

(7) Other Embodiments The specific configuration of the present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the scope of the invention.

a)
In the above-described embodiment, the flight conveyor is described as an example of the transport device, but the format of the transport device is not limited to this.

b)
In the above-described embodiment, the monitoring unit 20 determines the load state based on the current value A, but is not limited to this. For example, when the drive motor M1 has a speed reducer, the load state of the drive motor M1 differs depending on the reduction ratio of the speed reducer, and therefore the load state cannot be determined based on the current value. In this case, for example, the monitoring unit 20 may be configured to detect the torque of the drive motor M1 and determine the load state based on the detected torque.

c)
In the above-described embodiment, the ON / OFF of the determination function of the monitoring unit 20 is performed by the monitoring unit 20 using the stabilization time T3, but this function is not limited to this. For example, the monitoring unit 20 may not have this ON / OFF function, and the ON / OFF function may be realized by a program in the sequencer 30.

d)
In the above-described embodiment, the determination is performed based on whether or not the number N of measurement times and the measurement times T1 to T3 have reached the set number of times and the set time, but the determination method is not limited to this. For example, the determination may be made based on whether or not the number N of measurement times and the measurement times T1 to T3 exceed a set value.

e)
In the above-described embodiment, the retry function is realized by a program in the sequencer 30, but the configuration for realizing the retry function is not limited to this. For example, the retry function may be realized by hardware.

f)
In the above-described embodiment, the interval time measurement unit 34 starts measuring the interval time T2 after the measurement of the stable time T3 is completed. However, the present invention is not limited to this. For example, the interval time measurement unit 34 may start measuring the interval time T2 after the drive motor M1 is stopped and rotated forward (S11). In this case, the same effect as described above can be obtained regardless of the presence or absence of the measurement function of the stabilization time T3.

g)
In the above-described embodiment, detailed timer settings for preventing chattering are omitted, but there may be cases where these timer settings are made.

Schematic diagram of conveyor Schematic cross section of conveyor Example of conveyor flow diagram Example of conveyor flow diagram Example of operation timing chart of conveyor State diagram of conveyor when biting in foreign matter

Explanation of symbols

100 conveyor
1 Casing 3 Chain 4 Flight (conveying member)
6 Conveyed object 9 Bottom plate 10 Control device 20 Monitoring unit (load detection unit, load determination unit)
30 sequencer 31 drive switching unit 32 number of times measurement unit 33 number of times determination unit (first number of times determination unit, second number of times determination unit)
34 Interval time measurement unit 35 Interval time determination unit 36 Stop unit 37 Alarm unit 38 Upstream device control unit T1 Operation time T2 Interval time T3 Stabilization time TA Setting operation time TB Setting interval time TC Setting stabilization time N times NA Retry limit number ( First set number of times)
NB set number of times (second set number of times)

Claims (9)

A casing in which a conveyed product is supplied; a plurality of conveying members movable with respect to the casing; a connecting member that connects the conveying members; and the conveying member on the positive side in the conveying direction via the connecting member; A control unit used for a transport device including a drive unit that can be driven on the opposite side,
A load detection unit for detecting a load state of the drive unit;
A load determination unit that determines a load state of the drive unit based on a load state detected by the load detection unit;
A drive switching unit that causes the drive unit to switch between a positive side operation corresponding to the positive side in the transport direction and a reverse side operation corresponding to the negative side in the transport direction according to the determination result of the load determination unit;
A control device comprising: The load determination unit determines that the load state has reached a preset set load state, or that the load state has exceeded the set load state,
The drive switching unit causes the drive unit to perform a reverse side switching operation from the normal side operation to the reverse side operation based on a determination result of the load determination unit, and is set in advance after the reverse side switching operation. After the set operation time has elapsed, the drive unit is caused to perform a positive side switching operation from the reverse side operation to the positive side operation.
The control device according to claim 1. A frequency measurement unit that measures the number of times the load determination unit determines that the load is overloaded;
A first number determination unit that determines that the number of times of measurement in the number of times counting unit has reached a first set number of times set in advance, or that the number of times of measurement exceeds the first number of times of setting;
Based on the determination result of the number determination unit, a stop unit that stops the operation of the drive unit,
The control device according to claim 2, further comprising: It further includes an alarm unit that issues an alarm indicating that the drive unit is in the switching operation from the start of the reverse side switching operation to the completion of the forward side switching operation.
The control device according to claim 3. The load determination unit stops the determination of the load state until the preset settling time elapses after the completion of the positive side switching operation,
An interval time measurement unit that measures the time from when the load determination unit starts determination after the set stabilization time has elapsed until the determination result of the load determination unit is obtained, and
An interval time determination unit for determining that the measurement time in the interval time measurement unit has reached a preset set interval time, or that the measurement time has exceeded the set interval time,
The frequency measurement unit resets the measurement frequency based on the determination result of the interval time determination unit.
The control device according to claim 3 or 4. After completion of the positive side switching operation of the drive switching unit, an interval time measurement unit that measures the time until the determination result of the load determination unit is obtained,
An interval time determination unit for determining that the measurement time in the interval time measurement unit has reached a preset set interval time, or that the measurement time has exceeded the set interval time,
The frequency measurement unit resets the measurement frequency based on the determination result of the interval time determination unit.
The control device according to claim 3 or 4. A second number determination unit that determines that the number of times of measurement has reached a preset second number of times or that the number of times of measurement has exceeded the second number of times of setting;
Based on the determination result of the second number determination unit, an upstream device control unit that transmits a stop command to the upstream device of the transport device or transmits a command to reduce the transport amount to the upstream device;
The control device according to claim 5 or 6, further comprising: A casing in which a conveyed product is supplied, and
A plurality of transfer members movable relative to the casing;
A connecting member for connecting the conveying member;
A drive unit capable of driving the transport member to the forward and reverse sides in the transport direction via the connecting member;
The control device according to any one of claims 1 to 7, which controls an operation of the drive unit;
Conveying device equipped with. A casing in which a conveyed product is supplied; a plurality of conveying members movable with respect to the casing; a connecting member that connects the conveying members; and the conveying member on the positive side in the conveying direction via the connecting member; A drive unit that can be driven to the opposite side;
A detection step in which a load state of the drive unit is detected;
A determination step in which the load state of the drive unit is determined based on the load state detected in the detection step;
In accordance with the determination result of the determination step, a switching step in which switching of the forward side operation corresponding to the transport direction forward side and the reverse side operation corresponding to the transport direction reverse side is performed in the driving unit,
Control method.

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