JPS63180615A - Method of correcting side slip of conveyer belt - Google Patents

Abstract

PURPOSE:To surely correct even a slight side slip of a conveyer belt by inclining a correcting roll so as to use a conveyer belt side slip correcting means for moving the conveyer belt right and left so as to correct the position thereof. CONSTITUTION:When a slip amount xL (xR) is detected, it is substituted in the formula, U = XLX(U/l) = xR(V/l), so as to obtain the value of U, and thus obtained the value of U is verified. Then an actuating angle theta under the corresponding tension is calculated. When theta is obtained, signals are delivered to left and right stepping cylinders CL and CR which are therefore driven to extend and retract so that a correcting roll 4 is inclined by the actuating angle thetaand therefore the correcting roll 4 takes a position as indicated by the two-dot chain line. Thereby, a filter cloth having slipped laterally to the two-dot chain line position is corrected to a position as indicated by the solid line within t = l/V min., and therefore the filter cloth having no side slip runs in an working station.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a type in which two endless filter cloths with a water-containing substance sandwiched between them are wound around a plurality of rolls, or The present invention relates to a method for correcting lateral deviation of filter cloth and other various conveyor belts in a filter cloth traveling type dehydrator such as a type in which a pressure belt or a pressure roll is brought into pressure contact with a sheet of endless filter cloth.

(Conventional Technique If?) Conventionally, for example, as a filter cloth lateral shift correction method in a filter cloth traveling type dewatering device in which two endless filter cloths with a water-containing substance sandwiched between them are wound around multiple rolls, an interchangeable method has been used. A filter cloth lateral shift detector is placed appropriately in front of the position where the two filter cloths that have been separated and run on different courses first overlap (work zone introduction position), and a lateral shift correction device is placed in front of that. As the device deviation detector, an ON-OFF switch is used which sends a detection signal when the amount of lateral deviation of the filter cloth reaches a preset value, and as the tank deviation correction device.

It has a correction roll that presses against the filter cloth in order to guide the running direction of the filter cloth in reverse, and by tilting the correction roll at a certain angle (operating angle) from a position (non-operating position) perpendicular to the running direction of the filter cloth. A device with a structure that moves the filter cloth laterally to correct it is used, and when the tank shift detector detects that the filter cloth's lateral shift reaches the set value, the signal causes the tank shift correction roll to tilt at a certain operating angle. Generally known is a method in which the filter cloth is moved sideways and then returned to the side.

However, in this conventional method, 0N-
Since an OFF switch is used, not only is it not possible to correct a filter cloth deviation that is less than the set value, but even if the corrective action by the correction roll is started, if the filter cloth returns to the side slip setting value or less, the side slip detector will be activated. There is a drawback that the correction operation is turned off and the correction operation is stopped without sufficient correction of the lateral deviation.

On the other hand, in this type of lateral deviation correction method, the necessary correction by the lateral deviation correction roll is completed within the travel time for the filter cloth from the position of the lateral deviation correction roll to the work medical introduction position, and the deviation of the filter cloth is corrected in the working area. Therefore, if the filter cloth traveling speed is changed depending on the properties of the water-containing material to be treated, the amount supplied, etc., or if the filter cloth tension changes, the filter cloth should be adjusted accordingly. Therefore, it becomes necessary to change the operating angle of the lateral slip correction roll so that the required correction by the lateral slip correction roll is completed within the above travel time, but in such a case, in the conventional method, the operating angle of the correction roll is constant. The problem was that it was not possible to respond immediately to such needs.

(Problems to be Solved by the Invention) The present invention can reliably correct even the slightest lateral deviation of the conveyor belt, and when there is a change in the running speed or tension of the conveyor belt, the correction roll can be corrected accordingly. It is an object of the present invention to provide a method for correcting lateral deviation of a conveyor belt by which the operating angle can be selected.

(Means for Solving the Problems) In order to achieve the above object, the lateral slip correction method of the present invention provides a method for correcting lateral slippage in an endless conveyor belt that is guided by a plurality of guide shafts and travels to a work zone, and that performs work on the conveyor belt. The amount of lateral deviation on the left or right side of the conveyor belt is continuously detected at a lateral deviation detection position appropriately before the medical introduction position, and at the same time, it is pressed against the conveyance belt at a lateral deviation correction position between the medical introduction position and the lateral deviation detection position. using a conveyor belt stacking deviation correction means that moves and corrects the conveyor belt to the right or left by tilting a correction roll to the left or right from a non-operating position by a required operating angle; and Taking into consideration, calculating the operating angle of the correction roll necessary to correct the amount of lateral deviation of the conveyance belt within the traveling time from the correction roll to the work medical introduction position; and tilting the roll based on the calculated operating angle. Below, reference will be made to the drawings for an example in which the present invention is implemented in a method for correcting lateral deviation of filter cloth in a dewatering device that performs pressurized dewatering by winding two endless filter cloths with sludge sandwiched between them between multiple rolls. I will explain.

In the dehydrator shown in the first diagram, a liquid-permeable first filter cloth (1) and a second filter cloth (2) made of cloth or the like are endlessly wound around a number of rolls, and one of the first The filter cloth (1) extends horizontally from the roll (3) to the reversing roll (4) to form a natural dewatering section, and the other second filter cloth (2) extends horizontally from the roll (3) to the reversing roll (4), and the other second filter cloth (2) is extended horizontally from the roll (3) to the reversing roll (4) to form a natural dewatering section. (5)
The first pressure roll (6) is extended horizontally to form a natural dewatering section, and the first filter cloth (1) is extended horizontally to the first pressure roll (6), and the first filter cloth (1) is extended horizontally to the first pressure roll (6) to form a natural dewatering section.
is guided to the pressure roll (6) to polymerize with the second filter cloth (2), and the polymerized filter cloths (1) and (2) are guided to the pressure roll (6) to polymerize with the second filter cloth (2).
6) and a number of subsequent pressure rolls (7), (8),
(9), (10).

(11), (12), and (13), and then the polymerized filter fabrics (1) and (2) exiting the final pressure roll (13) are separated into upper and lower parts. , one of the first
The filter cloth (1) is guided to the roll (3) through the rolls (14), (15), (16), and the other second filter cloth (2) is guided through the rolls (17), (18), (19). , (20), (21
) to the roll (5), and these two wave cloths (1),
(2) is run at a predetermined speed using a final pressure roll (13) whose rotation is transmitted from a motor (22) as a driving roll. Regarding both types of cloth, one of the first filter cloths (1
).

A filter cloth left and right position continuous detection device (24A) that continuously detects the positions of both left and right sides of the filter cloth (1) at the introduction position (A) to the roll pressurized dewatering work zone is disposed, and The amount of lateral deviation of the filter cloth to the left and right at the filter cloth tank deviation detection position (B), which in this example is set between the rolls (3) and (16), appropriately before the work area zone warming position (A). A filter cloth tank shift detection device (25B) is installed to continuously detect the lateral shift detection device (25B), and a lateral shift correction position (C) is installed between the work area zone warming position (A) and the filter cloth tank shift detection position (B). In this example, a filter cloth tank misalignment correcting device (26C) is installed in which the reversing roll (4) is used as a correcting roll. (23) is a stirrer that mixes the sludge (m) with a flocculant and supplies it onto the natural dewatering section of the first filter cloth (1).

FIG. 2 shows the unfolded state of the filter cloth (1) from the work area zone warming position (A) to the lateral shift detection position (B). Here, the filter cloth lateral position continuous detection device (24A) is composed of a pair of left and right position continuous detection elements (AL) and (AR) installed on both left and right sides of the filter cloth (1).

In this example, the detection element is of a differential transformer type, and as shown in the third figure, a cylindrical coil consisting of a primary coil (27) and secondary coils (28) and (29) on both sides thereof includes a core(
A shaft (31) having a shaft (30) is inserted through the shaft so as to be movable in the axial direction, and the shaft (31) is always springed outward by a coil spring (32), and a roller (31) is attached to the tip of the shaft (31).
33) is pressed against the side of the filter cloth (1).

The displacement of the core (30) is linearly proportionally converted into an induced voltage in the secondary coil.

In addition, the filter cloth tank shift continuous detection device (25B) includes a pair of left and right side shift continuous detection elements (
8L) and (BR), and this detection element has the same structure as the position detection elements (AL) and (AR) shown in FIG.

These detection elements (Ashi), (AR) and (BL), (B
In this example, R) uses the normal position of the filter cloth (1) as the origin, and continuously detects left and right displacements from there.

The filter cloth tank misalignment correction device (26C) includes stepping air cylinders (CL), (
CR)'s rams are connected, and one cylinder is driven forward and the other cylinder is driven backward to move the correction roll (4) by the required operating angle from the non-operating position perpendicular to the normal running direction of the filter cloth (1). It is a structure that tilts to the left or right.

In the above configuration, a method for correcting lateral deviation of the filter cloth (1) will be explained. First of all, let's start with. Now, if the filter cloth deviates laterally to the position shown by the two-dot chain line in Fig. 2, the amount of lateral deviation to the left or right is χL = (bLaL) or χ = (b
It is represented by lIa@). This amount of deviation must be corrected within the time t=Q/V (minutes) for the filter cloth to move from the lateral deviation correction position IE (C) to the introduction position @ (A).

Also, the horizontal movement time required to complete the correction of the filter cloth by the correction roll is to=ZL/LI or to=ZJU where 1=1. Since it must be, Q/V=χL
The relational expression /U = χ*/U is established, and the following equation is derived from this relational expression.

U = ZLx (V/Q) = ZIX (V/Q) - (1) On the other hand, the corrected lateral movement speed U of the filter cloth by the correction roll
The relationship between θ and the operating angle θ of the correction roll is illustrated for cases where the tension of the filter cloth is different (T2, T3, TI).
It will look like the figure. In the figure, U and θ are each tension T of the filter cloth, T2, T3-T4 (however, Tz (large) → T4 (small)
) are in a proportional relationship.

Therefore, when the deviation amount χL (χ11) is detected, it is substituted into the above equation (1) to obtain U, and this U is compared with FIG. 4 to calculate the operating angle θ at the corresponding tension. Once θ is determined, the left and right stepping air cylinders (Ct
, ), (CR) to drive them forward and backward, and tilt the correction roll (4) to the position shown by the two-dot chain line in Figure 2 by an operating angle θ. The cloth is corrected to the position indicated by the solid line within the above-mentioned time period t=lV, and the filter cloth without lateral deviation is run to the work zone.

When the lateral deviation detection elements (BL) and (BR) detect that there is no lateral deviation of the filter cloth (1), the correction device (
26C) stepping air cylinder (Ct, ), (
CR) is driven in the opposite direction to the above to correct the correction roll (4).
Return to the position shown by the solid line in Figure 2 (non-operating position).

The above-mentioned correction operation may be performed by detecting the amount of lateral deviation every predetermined period of time, or may be performed continuously while the dehydrator is in operation.

If the traveling speed V of the filter cloth is changed depending on the properties of the sludge to be treated, the supply amount, etc., enter the changed value into V in the above equation (1), and if the tension T of the filter cloth is changed, the above U
4, select the appropriate tension, calculate the required operating angle θ in the same manner as above, and set the correction roll (
4) may be tilted by θ.

For example, a microcomputer may be used to perform the above calculations and operations, and the procedure can be summarized as follows.

First, from the work zone belt introduction position @ (A) to the side slip correction position (C
), the corrected lateral movement speed U of the filter cloth by the correction roll, and the operating angle θ of the correction roll, as shown in FIG. Other necessary calculation formulas are stored in the microcomputer in advance.

■Detected values a and alt by the left and right position detection elements (A1.) and (AR) at the work medical introduction position (A).

The lateral deviation amount χL or 1 generation is calculated from the detection values b+, b* by the left and right lateral deviation detection elements (BL), (BR) at the filter cloth tank deviation detection position (B).

(2) Calculate the correction time t from the filter cloth traveling speed (2) and Q.

(2) Calculate the corrected lateral movement speed U of the filter cloth by the correction roll according to equation (1) above.

■Current tension T of the filter cloth, U calculated by the above calculation
, and the relational diagram shown in FIG. 4, which has been stored in advance, determines the operating angle θ of the correction roll (4), and sends the signal to the left and right stepping cylinders to move the correction roll (4) at the angle θ. Activate.

It should be noted that conventionally known detection means may be used as the means for detecting the filter cloth traveling speed (1) and the tension T of the filter cloth.

In addition to the above example, the lateral position continuous detection device (24A) and the lateral shift continuous detection device (25B) of the present invention include a light emitting element (34
) and photodetector elements (35) arranged above and below, photoelectric continuous detection elements (AL), (AR) and (BL), (I3
R), and various others are selected and used depending on the purpose.

It is desirable to apply the method of the present invention to the other second filter cloth (2), whose structure is substantially the same as that of the above example.

(Effects of the Invention) According to the method for correcting lateral deviation of a conveyance belt of the present invention, even slight lateral deviation of the conveyance band can be reliably corrected by continuously detecting lateral deviation of the conveyance band and operating the correction roll. Moreover, by tilting the correction roll to an operating angle corresponding to changes in the running speed and tension of the conveyance belt, the necessary lateral deviation can be prevented within the time it takes for the conveyance belt to reach the work medical introduction position from the correction roll. The correction can be completed, thereby preventing the conveyor belt from traveling into the work zone with lateral deviation, and ensuring normal work execution within the work zone. It is.

4. Explanation of the drawings The drawings show embodiments of the present invention. Fig. 1 is a side view of the filter cloth traveling type dehydrator, Fig. 2 is an enlarged development view of the side shift correction method of the filter cloth, and Fig. 3 is an enlarged view of the side shift correction method of the filter cloth. FIG. 4 is an enlarged vertical cross-sectional view of a filter cloth position continuous detection element, FIG. 4 is a diagram of the relationship between the correction lateral movement speed of the filter cloth and the operating angle of the correction roll, and FIG. 5 is an enlarged view of another embodiment of the position continuous detection element. This is a route map.

1... First filter cloth, 4... Correction roll, A... Work medical introduction position, B... Filter cloth machine shift detection position, C...
Filter cloth machine misalignment correction position, θ...correction roll operating angle,
■...filter cloth running speed, T...filter cloth tension.

5th figure Middle 4th figure □θ

Claims (1)

[Claims] In an endless conveyor belt that is guided by a plurality of guide wheels and travels to a work zone, the left or right side of the conveyor belt is detected at a lateral shift detection position appropriately before the work zone introduction position of the conveyor belt. Continuously detecting the amount of lateral deviation, and tilting the correction roll that presses against the conveyance belt to the left or right by a required operating angle from the non-operating position to a lateral deviation correction position between the work zone belt introduction position and the lateral deviation detection position. By using a conveyor belt lateral deviation correcting means that corrects the conveyor belt by moving it to the right or left, and taking into account the running speed and tension of the conveyor belt, the conveyor belt is moved from the correction roll to the work area belt introduction position. Calculating the operating angle of the correction roll necessary to correct the amount of lateral deviation of the conveyance belt within the travel time up to the time of travel; and inclining the correction roll based on the calculated operating angle. A method for correcting lateral slippage of the constructed conveyor belt.