JPH04238699A - Operating method and device for screw press - Google Patents

Abstract

PURPOSE:To allow the continuous operation of high solid-liquid sepn. efficiency and to prevent the failure of a screw and outside cylinder with overload by subjecting the outside cylinder to decelerated rotation with a screw shaft. CONSTITUTION:The screw 3 wound around the peripheral part of the screw shaft 2 supported in the outside cylinder 1 is brought into sliding contact with the outside cylinder 1. When the outside cylinder 1 is overloaded by clogging of the outside cylinder 1, etc., on continuation of the solid-liquid sepn., this load is detected by a load detector 6 and is transmitted through a control board 7 to a control panel 8. The command based on this signal is sent to a speed change control motor 4a, by which the rotation of a motor 4 is decelerated and the load is decreased. The rotation of the outside cylinder 1 is stopped when the outside cylinder 1 is overloaded and the rotation is restarted when the load is decreased. The efficient operation of the screw press is thus executed while the press is continuously operated and the outside cylinder 1 is rotated backward.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to an operating method for a screw press and an improvement in its device. It is an object of the present invention to provide an operating method and device capable of preventing damage to the outer cylinder, the blades of the screw shaft, etc.

0002

2. Description of the Related Art Conventionally, there is Japanese Patent Publication No. 62-29158 as a technique similar to the present invention. This invention is a screw press that detects the load on the screw shaft and increases or decreases its rotation speed to stably obtain a dehydrated cake with a substantially constant low water content.

0003

[Problems to be Solved by the Invention] However, there are a variety of stock solutions that can be processed with a screw press, and these cannot be handled simply by adjusting the number of revolutions of the screw shaft. That is, if the stock solution is easily clogged, if the rotation speed of the screw shaft is forcibly increased when the clog occurs, there is a risk that the pressing section will be filled with cake and damage the screw and the outer cylinder.

0003

[Means for Solving the Problems] The present invention solves the above-mentioned problems.In a screw press, the outer cylinder is supported so as to be reversed with respect to the screw shaft, and the cake is clogged. If an excessive load is applied to the outer cylinder and screw shaft, reduce the load by gradually slowing down the rotation of the screw shaft so that the cake wraps around the screw shaft, wait until the load is reduced, and then restart the outer cylinder. The solid-liquid separation process is started by reversing the system.

[0004] In order to carry out the above-mentioned solid-liquid separation operation, the following measures have been taken. That is, in a screw press in which the outer cylinder is supported so as to rotate in the opposite direction with respect to the screw shaft, the prime mover for driving the outer cylinder 1 is an electric motor with a variable speed control motor that is separate from the prime mover for driving the screw shaft, and this electric motor is connected to a control panel via a load detector, and the rotation of the motor is increased or decreased based on an increase or decrease in the load.

[0005] By the means described above, when the space between the outer cylinder and the screw shaft is filled with cake and the load on the outer cylinder increases, the increase in load is detected by the detector, and the detected information is sent to the control panel. This is transmitted to the electric motor for driving the outer cylinder, and the electric motor is decelerated. Then, the load on the screw shaft is reduced by decelerating the outer cylinder, which was rotating in the opposite direction.Furthermore, as the deceleration progresses, the cake and the feed shaft begin to rotate, and the load on the outer cylinder becomes large. Reduce to. The detector then confirms that the load has been reduced, and after a certain period of time, the outer cylinder begins to rotate.

That is, in this invention, the screw and the reversible outer cylinder apply a shearing action to the cake to enhance the squeezing effect and separate the raw solution into solid and liquid.
When the load on the outer cylinder exceeds a certain limit due to cake filling, that is, becomes excessive, the rotation of the outer cylinder is decelerated and the load is reduced, which can prevent damage to the outer cylinder due to excessive load, and This also prevents damage to the screw shaft that operates together with the outer cylinder. However, in the present invention, the above-described operations are automatically performed by an electric motor with a variable speed control motor, a load detector, a control panel, etc., and are continuously operated. Hereinafter, the present invention will be specifically explained based on the drawings.

[0007]

[Example] In Fig. 1, reference numeral 1 denotes an outer cylinder which is rotatably supported with a screen stretched around its periphery, and 2 is a screw shaft supported within the outer cylinder 1, which is wound around the periphery. The screw 3 is arranged so as to come into sliding contact with the outer cylinder 1. and,
The outer cylinder 1 is driven by an electric motor 4 with a variable speed control motor, and the screw shaft is driven by an electric motor 5, so that these rotate in opposite directions.

The electric motor 4 for driving the outer cylinder 1 is connected to a load detector 6, and the load detector 6 is connected to a control panel 8 via a control panel 7.
The load increase/decrease signal is transmitted to the control panel 8. On the other hand, a feedback signal from the control panel 7 to the electric motor 4 based on the signal from the electric motor 4 is transmitted from the control panel 8 to the variable speed control motor 4a attached to the electric motor 4 via the control panel 7. .

The control panel 8 is also connected to an electric motor 5 for driving the screw shaft, so that the rotation of the screw shaft 1 can be adjusted based on the load applied to the outer cylinder 1. still,
In the one shown in FIG. 1, the stock solution is supplied into the outer cylinder 1 from a supply path 9 provided in the axial center of the screw shaft.

[0010] In the screw press configured as described above, the stock solution is supplied into the outer cylinder 1 from the above-mentioned supply path 9,
While being sent to the left in the figure by screw 3, solid and liquid are separated,
The filtrate drips from the periphery of the outer cylinder 1, and the cake is taken out of the machine from the left end of the outer cylinder 1.

[0010] When the load on the outer cylinder 1 increases due to continuous solid-liquid separation and the outer cylinder 1 becomes clogged, etc., and the outer cylinder 1 becomes overloaded, the present invention prevents the outer cylinder from being overloaded. By slowing down the rotation of the cylinder 1, the load can be reduced and damage to the outer cylinder 1 can be prevented.

That is, the load applied to the outer cylinder 1 is detected by the load detector 6, the signal is transmitted to the control panel 8 via the control panel 7, and a command based on this signal is sent to the speed change control motor 4a. , the rotation of the electric motor 4 is reduced and the load can be reduced.

[0012] In detail, this load reducing effect is as follows.
In this invention, since the outer cylinder 1 is configured to rotate in the opposite direction with respect to the screw shaft 2, when the electric motor 4 is decelerated to decelerate the rotation of the outer cylinder 1, a shearing action is applied to the cake stuck inside the outer cylinder 1. This is because the force exerted by the outer cylinder 1 is reduced. Therefore, when the rotation of the outer cylinder 1 approaches 0 rotations, the outer cylinder 1 becomes fixed, and the excessive load applied to the outer cylinder 1 is eliminated.

If the operation is continued in this state, the cake will be squeezed mainly by the conveying action of the screw 3. Therefore, the load applied to the outer cylinder 1 decreases, and by detecting this reduced load and sending a speed increase command to the electric motor 4 through the control panel 8, solid-liquid separation operation can be performed while the outer cylinder 1 is reversed. Can be restarted.

That is, if the outer cylinder 1 becomes overloaded, the outer cylinder 1
The rotation of the outer cylinder 1 is stopped, and when the load is reduced, the rotation is resumed, allowing efficient operation while continuing continuous operation and rotating the outer cylinder 1 in reverse.

[0015]

As described above, the present invention enables continuous operation with high solid-liquid separation efficiency by reversing the outer cylinder with respect to the screw shaft in a screw press.
This enables automatic operation while preventing damage to the outer cylinder etc. due to overload.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view of a screw press according to the present invention, schematically showing the operating system of the attached equipment. 1 Outer cylinder 2 Screw shaft 4 Electric motor 5 Electric motor 6 Load detector 7 Control panel

Claims (2)

[Claims] Claim 1: In a screw press in which an outer cylinder 1 is supported so as to be rotated in the opposite direction with respect to a screw shaft 2, the outer cylinder 1 is
is operated by a prime mover 4 equipped with a variable speed control motor separate from the screw shaft 2 while detecting the load, and when the load reaches a certain level or more, the rotation of the outer cylinder 1 is steplessly reduced to zero, and the rotation is stopped for a certain period of time. A method of operating a screw press characterized by causing the cylinder 1 and the screw shaft 2 to rotate together, and detecting the load on the prime mover again after a certain period of time has elapsed to increase the rotation speed of the prime mover 4. 2. In a screw press in which the outer cylinder 1 is supported so as to be rotated in the opposite direction with respect to the screw shaft 2, the outer cylinder 1
The prime mover for driving the screw shaft is an electric motor 4 with a variable speed control motor that is separate from the prime mover 5 for driving the screw shaft,
This electric motor 4 is connected to a control panel 7 via a load detector 6.
A screw press operating device characterized in that the rotation of the electric motor 4 is increased or decreased based on changes in the load of the electric motor 4.