JPH0622652Y2 - Flexible conveyor drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is directed to a flexible conveyor that drives and rotates a coil spring-shaped transfer body mounted in a flexible tube to convey granular materials such as grains. It is about.

(Prior Art) Conventionally, in this type of flexible screw conveyor, a coil spring-shaped transfer body is driven and rotated by a constant speed motor.

(Problems to be Solved by the Invention) In the above-described conventional technology, since the specified number of rotations is reached immediately after the motor is started and the transfer body is driven at a high speed, it is possible to cause a shock load at the time of start-up. Fatigue of the transporter,
The vibration of the transfer body causes the transfer body to come into contact with the flexible tube and cause abrasion of the tube.

In addition, the abrupt rotation of the transfer body as described above causes damage to the grain being conveyed and causes a large noise.

Furthermore, the particle size, shape, hardness, etc. differ depending on the type of granular material, and in the conventional constant-speed rotary flexible conveyor, the transfer efficiency,
In some cases, the damage rate of the particulate matter became a problem, and it could not be transported.

The present invention aims to solve the above-mentioned drawbacks of the prior art and to provide a flexible conveyor capable of transporting various kinds of granular materials.

(Means for Solving the Problems) In a flexible screw conveyor for rotating and driving a coil spring-shaped transfer body 2 installed in a flexible tube 1, the transfer body 2 is inverter-controlled. Circuit 3
And a slow start circuit 5 is provided in the inverter control circuit 3, and a flexible conveyor drive device is configured.

(Operation and effect of device) First, the frequency of the inverter control circuit 3 is adjusted according to the type of granular material to be conveyed to adjust and set the rotation speed of the motor 4, and then the power is turned on to start the motor 4. Then,
The rotation speed is sequentially increased by the slow start circuit 5 in the inverter control circuit 3 and reaches the set rotation speed after a predetermined time.

Therefore, the coil spring-shaped moving body 2 is driven by a gradual starting torque, and is sequentially rotated at a high speed to smoothly convey the granular material without receiving a shocking load as in the conventional case and generating vibration or noise. You can

Incidentally, the coil spring-shaped transfer body 2 does not carry at all during the low speed rotation by simply passing through the granular material and therefore has a small load, and the carrying force increases as the number of rotations sequentially increases. At the same time, since the load is increased, a smooth slow start is possible even if the start-up is performed in a state where the granular material remains in the tube 1.

When different types of granular materials are conveyed, the set frequency of the inverter control circuit 3 is changed, and the motor 4 is rotated at an optimum rotation speed to drive the transfer body 2,
It is possible to perform an efficient transfer work without damaging the transferred object.

Furthermore, when the flexible screw conveyor is used in combination with other grain adjusting equipment, for example, when used as a grain supply device to a grain huller, the grain is removed depending on the processing capacity of the grain huller. The transfer capacity can be adjusted, and automatic operation can be performed more easily.

(Embodiment) In the illustrated example, the flexible screw conveyor comprises a flexible tube 1 and a coil spring-shaped transfer body 2 installed in the tube 1, and a receiving portion is provided at a starting end thereof. 6
A discharge portion 7 is provided at the end portion.

The receiving portion 6 has a plurality of supporting rods 8 and 8 protruding from the outer periphery of the end of the tube 1, a bearing 9 held at the tips of the supporting rods 8 and 8, and a bearing rotatably held by the bearing 9 and a transfer body 2. It is composed of a rotating body 10 which is fixedly connected.

The discharge unit 7 is attached to a discharge pipe 13 attached to the upper end of the support pipe 12 standing on the base 11, and is configured to discharge the conveyed product from the discharge pipe 14 via the discharge pipe 13. That is, the discharge part 7 has a plurality of support rods 8 protruding from the outer periphery of the end of the tube 1.
8, a bearing 9 held at the tips of the supporting rods 8 and 8, and the bearing 9
And a rotary body 10 that is rotatably held by the transfer body 2 and has the end of the transfer body 2 fixedly connected thereto, and the tip angular shaft portion of the rotary body 10 is fitted into an engagement square hole of a pulley 16 of a belt transmission device 15. It is configured so that it can be transmitted together. 17 is an extraction cylinder 1
3 is a pipe that penetrates through the belt 3 and has a belt transmission device 15 inside.
A transmission shaft (not shown) between the gear box 18 and the lower portion of the take-out cylinder 13 is internally provided.

Next, the control circuit will be described. 20 is an operation box provided with a power switch 21, a rotation speed adjusting dial 22 and the like.

The inverter control circuit 3 is built in the base 11 and configured as follows.

Reference numeral 23 denotes a voltage command unit, which is configured so that the command voltage (a) can be changed by adjusting the rotation speed adjustment dial 22.

The slow start / slow stop control circuit 5 is composed of a resistor and a capacitor, and after the power switch 21 is turned on, the voltage is sequentially increased to reach the command voltage after a certain period of time, and when the power switch 21 is cut off, the voltage is sequentially decreased from the command voltage. The delay voltage (a ') can be output so as to cut off the energization after a predetermined time.

A saw blade signal generation circuit 24 generates a saw blade signal (b) having a cycle corresponding to the command voltage. 25
Is a frequency adjustment signal generation circuit, which is configured to be converted into a pulse signal (c) corresponding to a saw blade signal and a cycle and can be input to the binary counter 26 as a clock signal. 27
Is an output voltage adjustment signal generating circuit, which outputs a branch output from the saw blade signal generating circuit 24 to a pulse signal (d) for voltage control.
And is input as an address designation signal in the read-only memory (ROM) 28. The branch output of the frequency adjustment signal generating circuit 25 is also input to the read-only memory 28.

The read-only memory 28 includes a 4-bit signal from the binary counter 26, a signal branched from the frequency adjustment signal generation circuit 25, and an output voltage adjustment signal generation circuit 27.
In response to the read address designating signal by the combination of the signals from, the prestored three-phase sine wave pattern data value (not shown) is read, and each transistor (Tr ₁ ~ Tr ₆ ) is configured to be output to the base.

Reference numeral 30 is a power source, which is AC 100V or 20 for ordinary households.
A 0V power supply is used. Reference numeral 31 is a power supply rectifying circuit that converts alternating current into direct current. Three-phase sine wave voltage generation circuit 2
As described above, 9 is configured to receive the drive output from the read-only memory 28 to each of the transistors (Tr ₁ to Tr ₆ ) and supply the current of the three-phase specified frequency to the variable speed motor 4.

When starting the work of transporting grains and the like, first, the rotation speed adjustment dial 22 is operated to set the command voltage (a) of the voltage command unit 23 according to the type of grain and the like. Next, when the power switch 21 is turned on, the slow start / slow stop control circuit 5 sequentially raises the voltage to reach the command voltage after a fixed time. This command voltage is applied to the saw blade signal generation circuit 2
Is converted into a sawtooth signal (b) of a predetermined cycle by 4,
Further, the frequency adjusting signal generating circuit 25 and the output voltage adjusting signal generating circuit 27 respectively output as pulse signals. The pulse signal (c) from the frequency adjustment signal generation circuit 25 is branched, one of which is input as a clock signal to the 12-decimal counter 26, converted into a 4-bit signal and read to the read-only memory 28, and the other is directly read-only memory 28. Is input to the read-only memory 28 to specify the read address. As a result, the read-only memory 2
From 8 the respective transistors of the three-phase sine wave voltage generation circuit 29 are read out in synchronization with the clock signal to read out the three-phase sine wave pattern data value stored in advance and create a three-phase AC power supply of the frequency corresponding to the specified voltage. The drive signal is output to (Tr ₁ to Tr ₆ ).

Further, the pulse signal from the output voltage adjusting signal generating circuit 27 is also input to the read-only memory 28 to adjust the output voltage. This output adjusts the overcurrent generated when the frequency of the three-phase AC is lowered. From the three-phase sine wave voltage generation circuit 29, a three-phase alternating current having a frequency corresponding to the command voltage and a current value adjusted to an appropriate value is supplied to the speed change motor 4, and rotation is performed as specified by the rotation speed adjustment dial 22. The variable speed motor 4 is driven by the number.

The rotational force of the speed change motor 4 is transmitted to the transfer body 2 via the power transmission shaft, the gear box 18, the belt transmission device 15, the pulley 16, etc., but the transfer body 2 is stopped by the slow start circuit 5. After that, the rotation speed is sequentially increased and the command rotation speed is reached after a certain time. Therefore, the transfer body 2 is driven by a gentle starting torque and does not generate vibration or noise, and the grains that are received and conveyed from the receiving section 6 into the tube 1 are conveyed by selecting an optimum conveying speed. It is possible and does not cause damage to the grain. The grain conveyed in the tube 1 is discharged from the discharge unit 7 to the discharge cylinder 13 and is discharged from the discharge cylinder 14.

When the power supply switch 21 is shut off to stop the transfer work, the slow start and slow stop control circuit 5
Thus, the command voltage is sequentially decreased and stopped after a predetermined time, so that the transfer body 2 is gently stopped.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a perspective view, FIG. 2 is a control circuit diagram, and FIG. 3 is an output waveform diagram. In the figure, reference numeral 1 is a tube, 2 is a transfer body, 3 is an inverter control circuit, 4 is a variable speed motor, and 5 is a slow start circuit.

Claims (1)

[Scope of utility model registration request] 1. A flexible screw conveyor for rotating and driving a coil spring-shaped transfer body (2) mounted in a flexible tube (1) to transfer a granular material, the transfer body (2) having an inverter control circuit (3). A drive device for a flexible conveyor, which is configured to be driven by a motor 4 and in which a slow start circuit 5 is provided in the inverter control circuit 3.