JP2006076782A - Pipe conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe conveyor capable of preventing occurrence of trouble such as cutting of a conveyance chain and damage of functional parts of a device in the pipe conveyor. <P>SOLUTION: This pipe conveyor is provided with a main driving motor 17 for driving the conveyance chain 13 arranged in a pipe casing through a main driving wheel 16 and an auxiliary driving motor 19 for driving the other sections of the conveyance chain 13 through an auxiliary driving wheel 18. Chain transfer speed by the main driving motor 17 and chain transfer speed by the auxiliary driving motor 19 are controlled in synchronization by a control means 21. The main driving motor 17 drives at fixed target speed, and the control means 21 controls the auxiliary driving motor 19 by an inverter so as to change speed. At this time, the control means 21 detects a load current value consumed by the auxiliary driving motor 19 and feed-back controls rotation speed of the auxiliary driving motor 19 so that the load current value is within a set scope. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pipe conveyor using a plurality of drive motors.

  Inside the endless pipe casing, which is partially opened with the workpiece input port and the outlet, the endless transfer chain is equipped with transfer means with a circular blade attached to it, and it is installed in the intermediate path of the pipe casing. There is a pipe conveyor that is provided inside the corner portion and that is driven to be pulled by engaging with a conveying chain, and the driving wheel is driven by a driving machine (for example, see Patent Document 1).

When the transport distance of the pipe conveyor becomes long, the load of the drive machine that drives the transport chain, that is, the drive motor also increases, so a large capacity drive motor is required.
Japanese Patent Laid-Open No. 11-208849 (page 2-3, FIG. 1-7)

  For this reason, an excessive force acts on the transfer chain or the pipe casing due to a load variation during transfer, causing troubles such as cutting of the transfer chain and damage to functional parts of the apparatus.

  The present invention has been made in view of these points, and an object of the present invention is to provide a pipe conveyor that prevents troubles such as cutting of a transfer chain and damage to functional parts of the apparatus.

  The invention according to claim 1 is a main drive motor that drives a transfer chain disposed in a pipe casing via main drive wheels, an auxiliary drive motor that drives other portions of the transfer chain via auxiliary drive wheels, A pipe conveyor having a control means for synchronously controlling a chain transfer speed by a main drive motor and a chain transfer speed by an auxiliary drive motor, and a main drive motor for driving a transfer chain of the pipe conveyor via a main drive wheel The chain transfer speed of the conveyor and the chain transfer speed of the auxiliary drive motor that drives other parts of the transfer chain via the auxiliary drive wheel are synchronized and controlled by the control means, so that the cutting of the transfer chain in the pipe conveyor and the device function Prevent troubles such as damage to parts.

  The invention according to claim 2 drives the main drive motor in the pipe conveyor according to claim 1 at a constant target speed, and the control means controls the auxiliary drive motor at a variable speed by an inverter, and Since the target speed of the main drive motor is constant, only the auxiliary drive motor is controlled at a variable speed by the inverter, so that synchronization control of the auxiliary drive motor with respect to the main drive motor is facilitated.

  According to a third aspect of the present invention, the load current value consumed by the auxiliary drive motor is detected by the control means in the pipe conveyor according to the first or second aspect, and the auxiliary drive is performed so that the load current value falls within the set range. The rotation speed of the motor is feedback-controlled, and the load current value consumed by the auxiliary drive motor is detected, and the rotation speed of the auxiliary drive motor is feedback-controlled so that the load current value falls within the set range. Therefore, a speed sensor for detecting the chain transfer speed becomes unnecessary.

  According to the first aspect of the present invention, the chain transfer speed by the main drive motor that drives the conveyance chain of the pipe conveyor via the main drive wheel, and the auxiliary drive motor that drives other parts of the transfer chain via the auxiliary drive wheel. By synchronizing and controlling the chain transfer speed by the control means, it is possible to prevent troubles such as cutting of the transfer chain in the pipe conveyor and damage to functional parts of the apparatus.

  According to the second aspect of the invention, since the target speed of the main drive motor is constant, only the auxiliary drive motor is variable-speed controlled by the inverter, so that the synchronization control of the auxiliary drive motor with respect to the main drive motor is easy. Can be.

  According to the third aspect of the present invention, the load current value consumed by the auxiliary drive motor is detected, and the rotational speed of the auxiliary drive motor is feedback-controlled so that the load current value falls within the set range. A speed sensor for detecting the transfer speed can be eliminated, and the control system can be simplified.

  Hereinafter, the present invention will be described with reference to an embodiment shown in FIGS.

  FIG. 2 shows a pipe conveyor 11 in an endless pipe casing 12 partially opened with an object inlet (not shown) and an outlet (not shown). A conveying means having circular blades 14 attached to each other at a predetermined pitch is disposed.

  This pipe conveyor 11 is capable of three-dimensional piping capable of transporting a transported object 15 introduced into a pipe casing 12 from a transported object input port to a take-out port by a disk blade 14 transferred by a transport chain 13 Conveyor.

  As shown in FIG. 1, a main drive motor 17 that drives the transfer chain 13 through a main drive wheel 16 that engages with the transfer chain 13 is provided inside the corner portion of the pipe conveyor 11. An auxiliary drive motor 19 is provided on the inner side of another corner located on the side fed by the main drive wheel 16 to drive the transfer chain 13 through an auxiliary drive wheel 18 that engages the transfer chain 13 at this corner. The auxiliary drive motor 19 is provided with control means 21 for controlling the chain transfer speed V1 by the main drive motor 17 and the chain transfer speed V2 by the auxiliary drive motor 19 in synchronization.

  When the transport distance is long or the return resistance is large in the pipe conveyor 11, in addition to the main drive wheel 16 that drives the transport chain 13 and the main drive motor 17 that drives the main drive wheel 16, the chain return An auxiliary drive wheel 18 and an auxiliary drive motor 19 for driving the auxiliary drive wheel 18 are installed in the middle of the side, and the load on the main drive motor 17 is reduced by controlling the auxiliary drive motor 19 in synchronization.

  The auxiliary drive motor 19 is desirably an AC motor such as an induction motor or a synchronous motor for maintenance.

  As shown in FIG. 3, the control means 21 is connected to an AC motor 22 via a power converter 23 composed of a power semiconductor device that outputs power adjusted to an appropriate voltage and frequency to an AC power source 22. The auxiliary drive motor 19 is connected. The power converter 23 is connected to a control device 24 that controls the power converter 23 to operate the auxiliary drive motor 19 in accordance with the command. This control device 24 can realize high-performance speed control by taking in the operating state of the auxiliary drive motor 19 and performing feedback control of the power converter 23.

  At that time, the chain transfer speed V2 by the auxiliary drive wheel 18 and the auxiliary drive motor 19 needs to be close to the chain transfer speed V1 by the main drive wheel 16 and the main drive motor 17, so that the power converter 23 of the control means 21 It is desirable to incorporate an inverter and to synchronize the speeds of the main drive motor 17 and the auxiliary drive motor 19 using the current value control function of the inverter.

  In this case, the main drive motor 17 is driven at a constant target speed, and the control means 21 performs variable speed control of the auxiliary drive motor 19 using an inverter.

  For example, the control device 24 detects the load current value consumed by the auxiliary drive motor 19 from the detection unit 25, and controls the power converter 23 so that the load current value falls within the set range. The rotational speed of the drive motor 19 may be feedback controlled.

  Next, the function and effect of this embodiment will be described. In the flowchart shown in FIG. 4, the circled numbers are step numbers indicating control procedures.

(Step 1)
As shown in FIG. 4, the load current value consumed by the auxiliary drive motor 19 is detected, and the control device 24 determines whether or not the load current value is within the set range.

(Step 2)
When the load current value of the auxiliary drive motor 19 is within the set range, the load acting on the auxiliary drive motor 19 is appropriate, and the rotation speed of the auxiliary drive motor 19 at that time is maintained.

(Step 3)
If the load current value of the auxiliary drive motor 19 is not within the set range, it is determined whether or not the load current value exceeds the set range.

(Step 4)
If the load current value of the auxiliary drive motor 19 exceeds the set range, the tension of the transfer chain 13 seems to be larger than necessary, so the rotational speed of the auxiliary drive motor 19 should be reduced by a predetermined value. A control signal is output to the power converter 23 and the process returns to step 1.

(Step 5)
If the load current value of the auxiliary drive motor 19 is below the set range, the slack 13a of the transfer chain 13 seems to be larger than necessary, so the rotational speed of the auxiliary drive motor 19 is increased by a predetermined value. Thus, the control signal is output to the power converter 23, and the process returns to step 1.

  In this way, when the slack 13a of the transport chain 13 occurs on the chain delivery side of the main drive wheel 16 driven by the main drive motor 17, the rotational speed of the auxiliary drive motor 19 increases due to a decrease in load, and the transport drive 13 It operates to pull the slack 13a of the chain 13 with the auxiliary drive wheel 18, while the conveyance chain tension on the chain delivery side of the main drive wheel 16 increases, that is, as the load of the auxiliary drive motor 19 increases. The rotational speed of the auxiliary drive motor 19 is decreased, and the speed synchronization between the main drive motor 17 and the auxiliary drive motor 19 is automatically achieved.

  Then, the chain transfer speed V1 by the main drive motor 17 that drives the transfer chain 13 of the pipe conveyor 11 via the main drive wheel 16, and the auxiliary drive motor 19 that drives other parts of the transfer chain 13 via the auxiliary drive wheel 18 Synchronous control of the chain transfer speed V2 by the control means 21 can prevent troubles such as cutting of the transfer chain 13 in the pipe conveyor 11 and damage to functional parts of the apparatus.

  At this time, while the target speed of the main drive motor 17 is constant, only the auxiliary drive motor 19 is controlled at a variable speed by the inverter, so that the synchronization control of the auxiliary drive motor 19 with respect to the main drive motor 17 can be facilitated.

  Also, to detect the chain transfer speed by detecting the load current value consumed by the auxiliary drive motor 19 and feedback-controlling the rotation speed of the auxiliary drive motor 19 so that the load current value falls within the set range. This speed sensor can be eliminated, and the control system can be simplified.

  Note that a speed sensor for detecting the rotational speed of the auxiliary drive motor 19 may be installed, and the auxiliary drive motor 19 may be speed-synchronized with the main drive motor 17. Further, the auxiliary drive motor 19 can control the rotation speed even when a DC motor is used.

It is a schematic diagram showing an embodiment of a pipe conveyor according to the present invention. It is the perspective view which fractured | ruptured and showed a part of conveyor same as the above. It is a block diagram which shows the outline | summary of the control system of a conveyor same as the above. It is a flowchart which shows the control procedure of a conveyor same as the above.

Explanation of symbols

12 Pipe casing
13 Conveyor chain
16 Main drive wheel
17 Main drive motor
18 Auxiliary drive wheels
19 Auxiliary drive motor
21 Control means V1, V2 Chain transfer speed

Claims (3)

A main drive motor for driving a transfer chain disposed in the pipe casing via a main drive wheel;
An auxiliary drive motor for driving other portions of the transfer chain via auxiliary drive wheels;
A pipe conveyor comprising: control means for synchronously controlling a chain transfer speed by a main drive motor and a chain transfer speed by an auxiliary drive motor. The main drive motor should be driven at a constant target speed,
The pipe conveyor according to claim 1, wherein the control means performs variable speed control of the auxiliary drive motor using an inverter. The control means detects a load current value consumed by the auxiliary drive motor, and feedback-controls the rotational speed of the auxiliary drive motor so that the load current value falls within a set range. The described pipe conveyor.

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