JPH04119190A - Control unit for automatic positioning of forming board - Google Patents

Abstract

PURPOSE:To provide the title control unit so designed that the landing position for paper stock delivered form the space between upper and lower lips is calculated from L/b value and head pressure value to control the position of a forming board, thereby maintaining the distance between said landing position and the end of the forming board at a set value. CONSTITUTION:The respective values of lip divergence (b), lip position L and head pressure are inputted into a controller, and the landing position 17 for paper stock is operated from both the L/b and head pressure values. Thence, an optimal set value for the distance (x) between said landing position 17 and the forming board end 11 is inputted into the controller, and the position of the forming board is always detected by a position detector, thus maintaining the distance (x) at the set value through a driving mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a forming board for receiving paper raw material ejected from an opening of a head box in a paper machine.

(Conventional technology) The paper material ejected from the conventional head box is transferred to the upper lip,
An example of a means for controlling the lower lip and a head pressure detector, and an overview of the forming board will be explained with reference to FIG. A device 3 is provided, which adjusts and controls the L/b value by changing the lip opening degree and lip position, and determines the landing point of the paper material ejected from between the upper lip 4 and the lower lip 5 using a wire. It is decided to match the forming board 7 of Bart 6. Further, 10 is prestrol.

(Problem to be solved by the invention) In order to produce high-quality paper, the positional relationship between the landing point of the ejected paper raw material and the forming board is important, but in the past, the forming board was fixed, so the L/b was determined by the paper raw material. The operator manually adjusted the values and visually determined the optimal landing point (trial and error). This is time-consuming and requires work in a hot and humid environment with poor atmosphere, and if there are large changes in machine speed, the landing point changes significantly, making it impossible to set the above-mentioned positional relationship. There were other problems.

The present invention has been proposed to solve the above-mentioned conventional problems.

(Means for Solving the Problems) For this reason, the present invention provides a drive mechanism that enables the forming board to move in the line direction in a forming board in a paper machine wire part, and a position detection system for the forming board moved by the drive mechanism. It consists of a container and a control mechanism that optimally controls the distance between the landing point (flying distance) of the paper material and the edge of the forming board, and is a means to solve the problem.

(Function) The forming board is equipped with a position detector such as a row encoder, is movable in the line direction by a drive mechanism such as a stepping motor, and is equipped with a controller that has a CPUa function and can be linked with a higher-level model. Signals from the /b detector, head pressure detector, forming board position detector, and remote setting device are input, and signals are output to the forming board drive mechanism and display device. Then, input the L/b value, head pressure, and optimal distance X between the landing point of the paper raw material and the edge of the forming board to the controller, calculate the landing point of the paper raw material from the controller lever Llb value and the head pressure, and detect the position detector. Depending on the position, feedback is sent to the drive mechanism and the forming board is moved to the optimum X value.

(Example) The present invention will be explained below based on the example shown in the drawings.
FIG. 2 shows an embodiment of the invention. Note that the same parts in FIG. 1 as in FIG. 3 will be explained using the same reference numerals. In the figure, a forming board 11 is supported by a slider side 12, etc., as shown in FIG. It is provided movably in the line direction by a drive mechanism 13.

As shown in FIG. 2, the drive mechanism 13 includes a nut member 14 having a threaded hole fixed to the lower surface of the forming board 11, and a threaded rod 15 is screwed into the threaded hole. The forming board 1 is rotated by forward and reverse rotation of the drive mechanism (electric motor, stepping motor, air cylinder, etc.) 13 attached to one end of the
1 is moved, and the displacement is measured by the screw rod 1.
Position detector (rotary encoder,
It is detected by a linear sensor, etc.) 16. In addition, as shown in the block diagram of FIG. 1, the L/b detector,
The signal from the head pressure detector and the signal from the remote setting device for setting the value of the distance X to the edge of the forming board 11 are input to the controller, and the controller calculates L/b and the landing point of the paper material from the head pressure It looks like this.

Now, in FIG. 1, setting values, current values, etc. can be output to a CRT or digital display device, and control can be performed by connecting and cooperating with a host controller such as DC8 (distributed control system).

In the movable forming board and control having the above configuration, the controller calculates the landing point (flight distance) 17 using the same method as the conventional lip full opening control device based on the signals from the L/b detector and the head pressure detector.

The positional relationship X between the landing point 17 and the forming board 1 varies depending on the quality of the paper, such as high quality or medium quality, or the change in speed per second, and the optimum X value is input to the controller from a remote setting device or a host controller. The controller constantly detects the current position of the forming board 11 using a position detector, moves the forming board 11 to the X value of the optimal positional relationship using a drive mechanism, and displays its set value, current value, etc. on the display device. . Additionally, these operations are performed automatically and can be controlled remotely from the control room.

(Effects of the Invention) The present invention is configured as described above in detail, and automatically determines the landing point of the paper material ejected from between the upper lip and lower lip of the head box based on the L/b value and the head pressure value. Since the forming board is movable, the landing point and the optimal position X of the forming board can be set arbitrarily. Therefore, it is possible to handle a wide range of papermaking speeds, and remote control from the control room is possible. Furthermore, there is no need for operators to make visual adjustments (trial and error) at sites with poor atmospheres, and the yield rate during adjustments is also improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram including a side view of a forming board automatic positioning control device according to an embodiment of the present invention, FIG. 2 is a side view of the forming board moving mechanism in FIG. 1,
FIG. 3 is a side view showing an outline of a conventional forming board positioning control device. Explanation of main parts of the figure 1 - Slice body 2 - Lip vertical adjustment device 3 - Lip horizontal adjustment device 4 - Upper lip 5 - Lower lip wire part forming bow drive mechanism position detector landing point ( flight distance)

Claims (1)

[Claims] In the forming board in the paper machine wire part, there is a drive mechanism that allows the forming board to move in the line direction, a position detector for the forming board moved by the drive mechanism, a landing point (flying distance) of the paper raw material, and the forming board. A forming board automatic positioning control device characterized by comprising a control mechanism that optimally controls the distance to the edge.