JP2600827Y2 - Slice Lip Deformation Adjustment Device for Cross Section of Paper Machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling the deformation of a slice lip in a screen part of a paper machine.

[0002]

2. Description of the Related Art As shown in FIG. 5, a wet part of a paper machine has a wire part 1 and a press part.
rt) 2 and a raw material supply unit 4 for allowing the raw material liquid after passing through the screen to flow as a uniform thin film-like water flow on the running grate 3 in the above-mentioned grate net portion 1. Having.

FIGS. 6 and 7 show the raw material supply section 4.
As shown in an example, a slice 7 constituted by a top lip 5 and a bottom lip 6 is provided on a front wall portion of a head box 8 for giving an outflow head, and a support frame 9 on the front wall surface side of the head box 8 is provided. Multiple jacks 1
0 are arranged in the surface length direction (width direction: arrow X direction), and the blades 12 that can be moved up and down through the rods 11 by driving the jacks 10 are arranged along the tip surface of the top lip 5. The blade 13 is wound around the breast roll 14 by arranging it in the surface length direction and changing the opening amount of the nozzle 13 by changing the amount of protrusion of the blade 12 to the nozzle 13 which is the raw material liquid outlet by driving the jack 10. Raw material liquid 15 flowing out of slice 7 onto moving grate 3
(Japanese Patent Laid-Open No. 3-152)
287 etc.).

However, in the case of the raw material supply unit 4, the thickness of the outflow raw material liquid 15 can be set to an arbitrary value by raising and lowering the blade 12 by driving each jack 10. Since the tip of the lip 6 is thermally deformed by the temperature of the raw material liquid 15 (about 30 to 40 ° C.) and undulates, the thickness of the outflow raw material liquid 15 is not uniform in the surface length direction. for that reason,
Blade 1 according to the amount of deformation of the tip of bottom lip 6
2 is deformed in each part, but the mechanical deformation of the blade 12 may not be enough. That is, the blade 12 is usually about 6 mm thick, and the jack 10 is provided at a pitch of about 100 mm.
There is a limit in correcting the deformation of the bottom lip 6 by deforming the bottom lip 6. Even if the blade 12 can be locally deformed significantly, the fiber orientation of the raw material liquid 15 and the basis weight profile, etc. There is a problem that hinders.

For this reason, as shown in FIG. 8, a plurality of chambers 16 are formed below the bottom lip 6 so as to be arranged in the surface length direction, and hot water in a tank 18 heated by a heater 17 is operated by a pump 19. By supplying to the required chamber 16 and circulating the same, the thermal deformation of the bottom lip 6 can be corrected or, as shown in FIG. 9, the chamber 16 can be formed below the bottom lip 6 in the same manner as in FIG. do it,
It has been proposed to install a heater 17 in each of the chambers 16 and to correct the thermal deformation of the bottom lip 6 by heating the water in the chamber 16 by the heater 17 in the required location of the chamber 16. I have.

[0006]

However, in any of the systems shown in FIGS. 8 and 9, the chamber formed at a position distant from the tip of the bottom lip 6, which most affects the thickness of the raw material liquid 15. Since the thermal expansion effect is used in the portion 16, there is a problem that the thermal deformation of the tip of the bottom lip 6 cannot be corrected as desired.

Therefore, the present invention is designed to effectively correct the thermal deformation of the tip of the bottom lip.
It is an object of the present invention to provide a slice lip deformation adjusting device for a draft net portion of a paper machine, which can control the thickness of an outflow raw material liquid in the surface length direction to be constant.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a papermaking machine in which a raw material liquid is caused to flow out onto a plow mesh from a slice composed of a top lip and a bottom lip of a head box. A plurality of rubber heaters in the form of a thin sheet having a thickness of 2 to 3 mm in which a resistance element is arranged between two upper and lower silicon rubber sheets are arranged on the lower surface of the tip portion of the bottom lip in the net portion in the surface length direction. A configuration is adopted in which a control device for controlling the temperature is connected to each of the rubber heaters so as to be directly attached.

[0009] Also, a required distance from the lower end of the bottom lip of the bottom lip of the papermaking machine in which the raw material liquid flows out from the slice consisting of the top lip and the bottom lip of the head box onto the gauze. A groove extending in the surface length direction, and a slit extending in the longitudinal direction of the groove at the bottom of the groove, and in the groove,
A plurality of piezoelectric actuators may be arranged so as to be able to expand and contract in the width direction of the groove, and may further include a control device for controlling the operation amount of each of the piezoelectric actuators.

[0010]

According to the present invention, the temperature of each sheet-like rubber heater attached to the bottom of the bottom lip is controlled by a control device based on the detected thickness distribution of the paper. Can be directly modified to approach a planar state.

When the piezoelectric actuator is installed in the groove provided on the lower surface side of the bottom lip, when the piezoelectric actuator is driven, the bottom lip can be displaced in the vertical direction from the groove portion. The deformation of the part can be corrected. At this time, the deformation of the bottom lip can be performed with a slight force due to the presence of the slit at the bottom of the groove.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show one embodiment of the present invention. In the same construction as the raw material supply section 4 of the papermaking machine 1 shown in FIGS. A plurality of rubber heaters 20 with temperature sensors are provided on the lower surface of the tip of the bottom lip 6 of the slice 7 composed of the bottom lip 6 along the surface length direction at a required interval (for example, 10 mm).
A control device 21 is provided so as to be directly attached at 0 mm intervals) and to control the temperature of each rubber heater 20 by remote control. In addition, 2
Reference numeral 2 denotes a shower pipe.

The rubber heater 20 is a planar heater having a structure in which a resistive element is arranged between two upper and lower silicon rubber sheets and the whole is integrated into a thin sheet having a thickness of 2 to 3 mm.

When controlling the thickness of the raw material liquid 15 flowing out from the slice 7 onto the mesh 3, the blades 12 are moved up and down via the rods 11 by driving the jacks 10 arranged in the surface length direction, and the raw material liquid of the slice 7 is controlled. At this time, the temperature of each rubber heater 20 attached to the lower surface of the distal end of the bottom lip 6 constituting the slice 7 is controlled. To do.

That is, the raw material liquid 15 which has flowed out of the slice 7 onto the cross-net 3 of the cross-net 1 is passed through the press unit 2 and the drying unit, and is wound up by the reel at the end of the paper machine. At this time, the weight distribution of the paper is checked with a weight distribution measuring device such as a BM meter installed for measuring the basis weight and thickness of the paper in front of the reel, and the rubber heater 20 is determined based on the value. The deformation of the tip of the bottom lip 6 of the slice 7 is corrected by heating the rubber heaters 20 arranged in the surface length direction and remotely controlling the temperature of each part by using the control device 21 for Make sure to take care.

In the above description, the gap between the end of the bottom lip 6 of the slice 7 and the breast roll 14 is usually about 8 mm, but the thickness of the rubber heater 20 is 2 to 2 mm.
Since it is 3 mm and very thin, the rubber heater 20 is
It can be attached directly to the bottom surface of the bottom lip 6 which is most easily affected by the temperature of the raw material liquid 15 without any trouble. Therefore, by giving a temperature change by the heat of the rubber heater 20, it is possible to directly correct the thermal deformation of the distal end of the bottom lip 6 thermally deformed by the raw material liquid 15 so as to approach a flat state. In addition, the amount of mechanical deformation of the blade 12 can be reduced, whereby the fiber orientation, the basis weight profile, and the like can be accurately controlled.

FIGS. 3 and 4 show another embodiment of the present invention. In the same construction as the raw material supply section 4 of the papermaking machine screen 1 shown in FIGS. 6 and 7, FIG. A groove 23 having a required depth and width is provided in a slice 7 composed of a top lip 5 and a bottom lip 6 at a required distance from a tip portion on the lower surface side of the bottom lip 6 so as to extend in a surface length direction. With the bottom (upper side) of the groove 23
An appropriate number of slits 24 are provided along the direction in which the groove 23 extends, so that the bottom lip 6 has a flexible structure that can be displaced vertically from the groove 23 portion. A piezoelectric actuator (piezo stack) 25 made of a body is arranged and arranged at a required interval (for example, 100 mm interval) in the surface length direction so as to operate in a direction perpendicular to the longitudinal direction of the groove 23. A control device 27 is provided for sending a command to a voltage generator 26 which is a driving device provided for each piezoelectric actuator 25 to individually control the operation amount of each piezoelectric actuator 25.

In the case of the embodiment shown in FIGS. 3 and 4, as in the case of the embodiment shown in FIGS. 1 and 2, the piezoelectric distribution is measured based on the value of the paper weight distribution measured by the weight distribution measuring device. Using a control device 27 for the actuator 25, a voltage generator 26 of the piezoelectric actuators 25 arranged in the surface length direction.
Is driven to remotely control the amount of operation of the piezoelectric actuator 25 of each part, thereby correcting the deformation of the tip of the bottom lip 6 of the slice 7 so as to obtain a straightness. That is, when the piezoelectric actuator 25 is extended, the width of the groove 23 is pushed and expanded, so that the bottom lip 6 is deformed upward from the groove 23 as shown by a two-dot chain line in FIG. The deformation of the bottom lip 6 can be performed with a slight force because the groove 23 has the slit 24. Therefore, by individually controlling the operation amount of each piezoelectric actuator 25,
The thermal deformation of the tip of the bottom lip 6 that has been thermally deformed by the raw material liquid 15 can be mechanically corrected to approach a planar state. This makes it possible to control fiber orientation, basis weight profile, and the like with high accuracy, as in the above-described embodiment.

It should be noted that the present invention is not limited to only the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the present invention.

[0021]

As described above, according to the apparatus for controlling the deformation of the slice lip of the papermaking machine of the present invention, the resistive element is disposed between the upper and lower two silicon rubber sheets on the lower surface of the tip of the bottom lip. Since a plurality of rubber heaters in the form of a thin sheet with a thickness of 2 to 3 mm are arranged in the direction of the surface length and directly attached, and the temperature of each rubber heater can be individually controlled by the control device, The deformation of the tip of the bottom lip, which is most susceptible to the influence of the temperature of the raw material liquid, can be corrected so as to approach a flat state by the heat of the rubber heater. Since it can be attached, there is no need to provide a concave portion on the lower surface of the tip portion of the bottom lip, and mounting is easy, and A groove extending in the surface length direction is provided on the lower surface side of the bottom lip, a slit is provided at the bottom of the groove, a plurality of piezoelectric actuators are installed in the groove along the surface length direction, and the operation amount of each piezoelectric actuator is reduced. With the configuration that can be controlled individually by the control device, the deformation of the tip of the bottom lip can be corrected mechanically, and the deformation of the tip of the bottom lip can be easily performed with a small force. Can be done,
Therefore, the amount of mechanical deformation of the blade for adjusting the thickness of the effluent solution provided on the top lip side can be reduced, and the thickness and basis weight of the paper can be stabilized, and the quality in the surface length direction can be improved. It has an excellent effect that it can be kept constant.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a device for adjusting the deformation of a slice lip of a papermaking machine of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a schematic view showing another embodiment of the present invention.

FIG. 4 is a perspective view of the bottom lip shown in FIG. 3 as viewed from below.

FIG. 5 is a schematic configuration diagram illustrating an example of a wet section of the paper machine.

FIG. 6 is an enlarged view showing an example of a raw material supply section provided in a wet section.

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a schematic view showing an example of a recently proposed method of preventing deformation of a bottom lip.

9 is a schematic diagram showing another example different from FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plow net 3 Plow net 5 Top lip 6 Bottom lip 7 Slice 15 Raw material liquid 20 Rubber heater 21 Control device 23 Groove 24 Slit 25 Piezoelectric actuator 27 Control device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-207395 (JP, A) JP-A 1-114698 (JP, U) European Patent Application Publication 46434 (EP, A1) (58) Fields investigated (Int.Cl. ⁶ , DB name) D21F 1/02-1/06

Claims (2)

(57) [Scope of request for utility model registration] An upper and lower two lips are provided on the lower surface of the tip of the bottom lip in a papermaking machine mesh portion in which a raw material liquid is caused to flow out onto a mesh mesh from a slice composed of a top lip and a bottom lip of a head box. A plurality of rubber heaters in the form of a thin sheet having a thickness of 2 to 3 mm with a resistance element disposed between silicon rubber sheets are arranged in the direction of the surface length so as to be directly attached and attached, and a temperature is set to each of the rubber heaters. A device for controlling the deformation of a slice lip in a drafting section of a paper machine, characterized in that the device has a configuration in which a control device for controlling the lip is connected. 2. A required distance from a lower end of a bottom lip of a bottom lip of a papermaking machine screen portion in which a raw material liquid is caused to flow out from a slice composed of a top lip and a bottom lip of a head box onto the traversing screen. Position
Providing a groove extending in the surface length direction, providing a slit extending in the longitudinal direction of the groove at the bottom of the groove, and arranging a plurality of piezoelectric actuators in the groove so as to be able to expand and contract in the width direction of the groove; And a control device for controlling the amount of operation of each of the piezoelectric actuators.