JPS61183009A - Conveyor speed control device - Google Patents

Abstract

PURPOSE:To control a conveyor speed properly by computing an effective diameter based on the diameter of a round bar material and both a reference diameter and an inclination angle of a V-roller, and also computing a reference revolving speed of the roller so as to control the detected roller revolving speed in a V-roller conveyor speed control device for round bars and the like. CONSTITUTION:An effective conveying diameter Dm is computed based on the diameter of a round bar and both a reference diameter and in inclination angle of a V-roller, and its computed result is inputted into a speed reference arithmetic circuit 6. The arithmetic circuit 6 then computes the revolving speed Ns of the V-roller against the set speed Vs based on the set speed Vs and the effective diameter D permitting its result to be inputted into a speed control circuit 8. The speed control circuit 8 compares the detected speed N which has been inputted, with the reference speed Ns so as to control the roller speed through a speed controller 9. This configuration enables the control of conveyor speed to be improved.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a pipe or a round bar that conveys a material having a circular cross section.
The present invention relates to a conveyance speed control device that controls the conveyance speed of a shape roller.

[Technical background of the invention and its problems] ■Shaped roller conveyance devices are used for conveying materials in processing lines that manufacture and process products and materials (hereinafter referred to as materials) with circular cross sections such as pipes and round bars. Commonly used.

Figure 2 is an example of a V-shaped roller that conveys a round bar.
As the shaping roller 2 rotates, the round bar 1 placed thereon is conveyed to the next process.

The V-shaped roller 2 is driven by an electric motor 3, but the ratio between the rotational speed of the ■-shaped roller 2 and the conveyance speed of the round bar 1 being conveyed is not constant, but changes depending on the diameter of the round bar 1 being conveyed.

That is, when the diameter of the round bar 1 changes, the contact position between the round bar 1 and the V-shaped roller 2 changes, and the effective conveyance diameter of the V-shaped roller 2 changes, so that the conveyance speed changes.

If the conveyance speed changes, for example, the time from leaving the heating furnace to reaching the next process changes, causing difficulty in controlling the temperature of the material and causing a decline in product quality.

Also, due to the relationship with the processing speed of the next process, when the conveyance speed is fast, it is necessary to temporarily wait for the round bar 1, and when it is slow, there is a waiting time for the round bar 1 to arrive, which is a factor that reduces productivity. .

Therefore, it is necessary for the operator to adjust the rotational speed of the electric motor 3 to match the predetermined conveyance speed, resulting in a problem of increased burden on the operator.

[Object of the Invention] The present invention provides a rational conveyance speed system t10S that appropriately controls the conveyance speed by calculating the effective conveyance diameter of the V-shaped roller. The purpose is to provide an i-location.

[Summary of the Invention] The present defense provides a conveyance speed control device that controls the conveyance speed of a V-shaped roller that conveys a material having a circular cross section such as a pipe or a round bar, which includes a speed setting device that sets the conveyance speed of the V-shaped roller;
a speed detector that detects the rotational speed of the V-shaped roller; an effective diameter calculation circuit that calculates the effective conveying diameter of the ■-shaped roller from the diameter of the circular material to be conveyed, the reference diameter and angle of the V-shaped roller; a speed reference calculation circuit that calculates the rotational speed of the V-shaped roller corresponding to the conveyance speed of the conveyor set by the speed setting device based on the conveyance effective diameter, and a speed detector that uses the calculated rotational speed as the speed reference. Equipped with a speed control circuit that feeds back the output to control the speed of the drive motor, so even if the diameter of the round bar changes and the contact position with the 0-ra changes, the rotation speed is automatically adjusted and conveyed. This allows the speed to be accurately controlled to the target speed.

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

In FIG. 1, the effective conveying diameter of the V-shaped roller 2 is calculated by a calculation circuit 7 from the reference diameter and inclination angle of the V-shaped roller 2 and the diameter of the round bar 1 to be conveyed.

Based on the obtained conveying effective diameter and the setting value of the speed setting device 5, the rotational speed of the V-shaped row 52 corresponding to the setting value is calculated by the calculator 10, and the obtained rotational speed is used as the speed standard, ■ Feedback the rotational speed of type RO52,
The speed of the drive motor 3 is controlled.

Next, the relationship between the conveyance speed V of the round bar 1 and the rotational speed N of the V-shaped roller will be explained with reference to FIG.

The diameter of the round bar 1 is Dm, and the standard diameter of the V-shaped roller 2 is Do.
, the inclination angle of the V-shaped roller 2 is θ, the effective conveyance diameter is N, the rotational speed of the V-shaped roller 2 is N, and the change in the radius of the V-shaped roller 2 due to the contact position between the round bar 1 and the V-shaped roller 2 is X. Then, the third
From the figure, the following equations (1) and (2) hold true.

X-(Dm/2) ・tanθ-sinθ ・(1)
DmDo +2x...(2)
Substituting equation (1) into equation (2), DmDo +DIIl tanθ−sinθ −(
3), and the effective conveyance radius of the V-shaped roller 2 is calculated from the diameter Dm of the round bar 1, the approximate diameter DO of the V-shaped low roller, and the inclination angle θ of the V-shaped roller 2.

Further, the conveyance speed ■ is given by V-π・D-N (4), and the rotational speed N of the ■-shaped roller 2 is given by the formula (3) and (
4) From the formula, N-V/π(Do +0m tan θ -si
nθ)... (5)

That is, the diameter Dm of the round bar 1, the reference diameter DO of the V-shaped roller 2
and the inclination angle θ, and the desired conveyance speed Vs to V
By calculating the rotational speed NS of the shaped roller 2 and performing feedback speed control so that the rotational speed Ns is achieved, the conveying speed (2) can be automatically controlled to the target speed Vs.

In other words, in Fig. 1, the rotational speed N of the ■-shaped roller 2 is
In order to detect this, a pulse transmitter 4 is attached to the electric motor 3, and a speed detection circuit 10 is connected to the output side of the pulse transmitter 4.

The speed detection circuit 10 converts the pulse signal output from the pulse transmitter 4 into an electric! 113 rotation speed i.e. V type O-
It is converted into a signal N corresponding to the rotational speed of the roller 2.

The electric motor 3 is supplied with controlled power for speed control from an alternating current power supply AC via a speed regulator 9 , and the speed regulator 9 is controlled by a speed control circuit 8 .

A speed reference signal NS given from the speed reference calculation circuit 6 and an actual rotational speed feedback signal N given from the speed detection circuit 10 are input to the speed control circuit 8.
A control operation is performed to make the deviation of the two signals zero.

The speed reference signal NS is based on the conveyance speed reference vS set by the speed setting device 5 using equation (5) and the effective diameter calculation circuit 7.
It is calculated from the conveyance effective diameter given by .

In addition, the effective diameter of conveyance is calculated using the formula (3), which is the diameter D of the round bar 1.
It is calculated from Ill, the reference diameter DO of the V-shaped roller 2, and the inclination angle θ.

Using the above circuit configuration, the diameter DI of the round bar 1 to be transported
11, the rotational speed N of the V-shaped roller is automatically adjusted and a predetermined conveying speed can be obtained.

In addition, the electric motor 3 and the speed regulator 9 are the former being a DC machine,
In addition to the combination in which the latter is a speed regulator by adjusting the armature voltage or field current or both, it is also possible to use a combination in which the former is an alternating current machine and the dominant is a frequency converter.

Further, the control system may be of an analog type, a digital type using a microcomputer, or a hybrid type using a combination of both.

Further, the diameter DIIl of the round bar 1 can be manually set using a setting device, but it can also be automatically set by calculation from the running time of an arbitrary section and the rotational speed of the V-shaped roller 2.

[Effects of the Invention] As explained above, according to the present invention, a predetermined conveying speed can be automatically obtained without requiring complicated manual operations for speed adjustment by an operator, improving quality and speeding up the line. It becomes possible to achieve overall labor savings and improve production efficiency.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the conveying speed control device of the present invention, FIG. 2 is a perspective view of a square-shaped roller conveyor for conveying round bars, and FIG. 3 is a detailed sectional view thereof. 1...Round bar, 2...V-shaped roller 3...
・Electric motor, 4...Pulse transmitter 5...
Speed setting device 6...Speed reference calculation circuit 7...Transfer effective diameter calculation circuit 8...Speed control circuit 9...Speed regulator 10...Speed detection circuit (7317) Agent Patent attorney Nori Chika Kensuke (and 1 others)
given name)

Claims (1)

[Claims] A conveying speed control device that controls the conveying speed of a V-shaped roller that conveys materials with circular cross sections such as pipes and round bars includes a speed setting device that sets the conveying speed of the V-shaped roller, and a speed setting device that detects the rotational speed of the V-shaped roller. A speed detector, an effective diameter calculation circuit that calculates the effective conveyance diameter of the V-shaped roller from the diameter of the circular material to be conveyed, the reference diameter and angle of the V-shaped roller, and a speed setting based on the calculated effective conveyance diameter. A speed reference calculation circuit calculates the rotational speed of the V-shaped roller corresponding to the conveyor conveyance speed set by the conveyor, and the speed of the drive motor is determined by feeding back the detection output of the speed detector using the calculated rotational speed as the speed reference. A conveyance speed control device comprising a speed control circuit for controlling.