CN2435419Y - A pressure type headbox - Google Patents

Abstract

A pressure type flow box belongs to the technical field of papermaking and is designed for reducing power consumption. The slurry inlet distributor comprises a slurry inlet distributor 10, a flow state adjusting flow channel, a ox horn-shaped upper slurry channel 50 and a sealing cover 90, and is characterized in that the flow state adjusting flow channel is a flash chamber 20 which is filled with slurry from the bottom and the outlet of which is positioned at the top, the outlet of the flash chamber is tightly connected with a throttling opening 30, and the throttling opening is directly connected with a vertical upward divergent flow channel 40. The speed of the vehicle can reach 160-180 m/min, and the quantitative of paper can be regulated between 14-28 g/m.

Description

A pressure type headbox

The utility model belongs to the technical field of papermaking, in particular to a net box of a cylinder paper machine.

The headbox of the traditional toilet paper rotary paper machine is open, and the speed of the pulp on the net is slow, which limits the speed of the paper machine. Although the pressure net box can adapt to higher speeds, in order to ensure the uniform distribution and interweaving of the high-speed flowing slurry and the fibers in it, several homogenizing rollers and several twists and turns are often set in the headbox and sometimes throttling. The enlarged pulp channel has a complicated structure and increases power consumption.

The purpose of the utility model is to provide a pressure-type headbox with simple structure and relatively energy saving, which is suitable for a rotary paper machine.

This purpose is achieved as follows:

A pressure-type headbox, which includes a slurry inlet distributor, a flow state adjustment flow channel, a horn-shaped upper slurry channel and a sealing cover, is characterized in that the flow state adjustment flow channel is: a slurry feed from the bottom and Its outlet is located in the expansion chamber at its top, and its outlet is closely connected to the throttle port, and the throttle port is directly connected to a vertically upward gradually expanding flow channel.

When the above-mentioned "a kind of pressure headbox" is applied to the toilet paper cylinder paper machine, and the pulp flow in it reaches a certain flow rate to adapt to the speed of the paper machine, the pulp fibers in it are not easy to accumulate and settle. The expansion chamber diffuses and the throttling slurry enters the vertically upward gradually expanding flow channel through the throttle port. Under the interaction of gravity and jet flow, in addition, it is throttled again on the horn-shaped slurry channel. The fibers can also form sufficient horizontal interweaving to form a paper sheet with a small vertical and horizontal tension difference.

Introduce an embodiment of the present utility model below in conjunction with accompanying drawing:

Fig. 1 is a schematic diagram of an embodiment.

As shown in the figure, a pressure type headbox of the utility model is arranged close to the rotary screen 1 . There is a seal cover 90 on its top, and the seal cover 90 also seals the part of the sizing side of the cylinder screen 1 . In the inside of the sealing cover 90, air is forced to flow and blow to the sizing side of the cylinder 1, so that the newly formed "wet paper" here can avoid being thrown off by its own centrifugal force with the rotation of the cylinder 1, and at the same time strengthen the Dehydration of "wet sheets".

As shown in the figure, the lowest part of a pressure-type headbox of the utility model is the pulp inlet distributor 10, and the expansion chamber 20 is fixed above the pulp inlet distributor 10, and the outlet of the expansion chamber 20 is closely connected with the throttle port 30. , the throttle port 30 is directly connected to a vertically upward gradually expanding channel 40, and the top of the gradually expanding slurry channel 40 is close to the side of the cylinder 1, and is surrounded by the mesh surface of the cylinder 1 and the arc plate 52 to form a tapered The horn-shaped sizing channel 50.

The slurry inlet distributor 10 is a square tapered tube slurry inlet distributor. Its upper side panel is a perforated plate 11 . The use of perforated plates (instead of parallel tube arrays) can generate microturbulence when the slurry flows through, which is beneficial to the interweaving of fibers.

The expansion chamber 20 has a shape of a cylinder cut by a plane parallel to its core line, especially a semi-cylindrical shape. Its arc surface is above.

The expanding channel 40 is in the shape of a cylinder with a trapezoidal end face, and the long base of the trapezoid is at the top.

The width of the throttle opening 30 is generally between 4-8 centimeters, and its length varies with the width of the paper machine.

The arc-shaped plate 52 is attached with an adjustment device, by adjusting its horizontal (left and right as shown in the figure) position and inclination angle to "fine-tune" the shape of the horn-shaped upper slurry channel, especially the upper end of the arc-shaped plate 52 and the net of the rotary screen 1. The width of the gap between faces. This is a common method used to adjust the speed of the screen and the quantitative method of the paper.

An overflow device is provided on the upper part of a pressure flow packing box of the utility model. During work, control the liquid level in the headbox to be slightly higher than the overflow hole position to discharge foam, laitance and other sundries and improve the quality of paper.

The pulp fed into the pulp distributor 10 comes from the head box or the pulp pump.

When designing, it is preferable to make the velocity of the slurry flow through the circular holes of the perforated plate 11 be between 150-180 m/min. The aperture and number of holes of the perforated plate 11 can be solved according to parameters such as the required flow area, and the aperture is preferably about 10-18 mm.

The paper machine adopting the pressure type headbox of the utility model can reach a speed of 160-180 m/min, and the quantification of paper can be adjusted between 14-28 g/m2.

Claims (4)

1. pressure type head box, include into slurry distributor (10), fluidised form adjustment runner, cattle horn shape online slurry road (50) and seal closure (90), it is characterized in that described fluidised form adjusts runner and be: one is advanced the flash chamber (20) that slurry and its outlet are positioned at its top from its bottom, its outlet is close to restriction (30), restriction (30) the flaring runner (40) straight up that directly continues again.

2. a kind of pressure type head box according to claim 1 is characterized in that: describedly advance to starch distributor (10) side of being Taper Pipe and advance to starch distributor.Its upper panel is porous plate (11).

3. a kind of pressure type head box according to claim 1 is characterized in that: described flash chamber (20), and have cylinder and be parallel to the shape that cut off on the plane of its heart yearn, its arc surface is up.

4. a kind of pressure type head box according to claim 1 is characterized in that: described flaring runner 40, its shape are that end face is trapezoidal cylinder, and this trapezoidal long base up.