JP2844904B2 - Twin wire equipment for papermaking machines - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a twin-wire device for a papermaking machine.

[Prior Art] Initial dewatering before finishing dewatering of a papermaking machine has a very large effect on paper.

FIGS. 5 and 6 show an example of a part for performing initial dewatering of the papermaking machine. The raw material 3 discharged from the slice lip 2 of the head box 1 is supplied to a bottom wire fixing base 4 by a breast roll 5A and a suction coach roll 5B. Is formed on a bottom wire 6 supported via a bottom wire drive roll 5C and is conveyed. The forming board device 7 provided on the most upstream side in contact with the lower surface of the bottom wire 6 A plurality of blades are provided on the downstream side of the forming board device 7 with a required interval, and the edge 27 is opposed to the direction of transport of the bottom wire 6 via the blade mount 26 as shown in FIG. Foil having a small angle (foil angle) θ that is oriented backward and inclined to the upper surface, and is replaceable in a direction perpendicular to the transport direction. The initial dewatering from the lower surface of the raw material 3 is performed by a lower initial dewatering zone 10 provided with a required number of wet suction boxes 9 and the like provided downstream of the foil box device 8 and the foil box device 8. Further, on the bottom wire 6 on the downstream side of the wet suction box 9, a top wire 11 is provided to be supported by a top wire fixing base 13 via a top wire roll 12, and the bottom wire 6 and the top wire
A twin-wire device 14 is configured by 11.

A dewatering element 15 for forcibly dewatering the bottom wire 6 and the top wire 11 is attached to the top wire fixing base 13.

A dehydrating tube 16 connected to the dehydrating element 15 is provided on the driving side (the left side in FIG. 6) of the twin-wire device 14. The dehydrating tube 16 is connected to a vacuum source 17 via a vacuum pipe 18. A separator 19 is attached, and water sucked and dewatered by the dewatering element 15 is guided to a water channel 20.

Further, on the driving side, a driving device 21 for driving the top wire roll 12 and a driving device for driving the bottom wire drive roll 5C (not shown) are provided.

The illustrated twin-wire device 14 has a structure in which the bottom wire 6 and the top wire 11 can be replaced by a cantilever method.

That is, the upper member 4a of the bottom wire fixing gantry 4 and the upper member 13a of the top wire fixing gantry 13 can be respectively extended to the drive side, and the respective extensions 4a ', 13a' can be pushed down and supported by the pressing devices 22, 23. In addition, among the support legs 4b, 4c, 13b, 13c of the bottom wire fixing frame 4 and the top wire fixing frame 13, the support legs 4c, 13c on the operation side (the right side in FIG. 6) are connected to the bottom. A cut-out portion for passing the wire 6 and the top wire 11 is provided, and a remover block 24 is provided in the cut-out portion, and the remover block 24 is provided in a state where the extension portions 4a ', 13a' are pushed down by the pressing devices 22, 23.
Bottom wire 6 and top wire
11 exchanges are available.

The raw material 3 discharged from the slice lip 2 of the head box 1 onto the bottom wire 6 is conveyed in the direction of the arrow by the driving of the bottom wire 6 and dewatered by spontaneous falling on the forming board device 7 in the lower initial dewatering zone 10. The water is further dehydrated by the free fall by the foil box device 8 and the suction by the negative pressure generated by the foil angle θ of each blade 28, and is further dehydrated by the suction by the wet suction box 9, and the initial dehydration from the lower surface is performed.

The raw material 3 that has been subjected to the initial dehydration from the lower surface is subjected to forced dehydration from both upper and lower surfaces by the dehydrating element 15 while being sandwiched between the bottom wire 6 and the top wire 11, and then to the downstream side. Transported to

According to the dehydration by the twin wire device 14, first, the lower dehydration zone 10 performs gentle dehydration by initial dehydration from the lower surface to stabilize the raw material and improve the yield. By forcibly dehydrating from the upper and lower surfaces, it is possible to manufacture a product having no two sides on the front and back.

In the twin wire device 14, the papermaking conditions (basis weight,
If the speed of the top wire 11 changes, it is necessary to adjust the thickness of the raw material 3 of the population of the top wire 11 in the lower initial dewatering zone 10 so as to match the dewatering capacity of the top wire 11. Conventionally, a combination arrangement such as changing the number of blades 28 of the activated foil box device 8 in the lower initial dewatering zone 10, replacing the blade 28 with one having an appropriate foil angle θ, or a wet suction box 9 By adjusting the vacuum pressure.

[Problems to be Solved by the Invention] However, depending on the combination arrangement of the blades 28 and the adjustment of the vacuum pressure of the wet suction box 9 as described above, depending on the papermaking conditions, the thickness of the raw material 3 of the population of the top wire 11 may be reduced. Insufficient adjustment has caused the formation to deteriorate.

That is, when making thin paper, the concentration of the raw material 3 is low, so that the raw material 3 is sufficiently dehydrated in the lower initial dewatering zone 10, so that the thickness of the artificial raw material of the top wire 11 can be secured unless the amount of dewatering is adjusted. There is a problem that the two-sidedness of the paper cannot be obtained, and the required blade 28 of the foil box device 8 is removed and adjusted for this purpose. The fibers are entangled with each other, which deteriorates formation.

Also, when making thick paper, the concentration of the raw material 3 is so high that it is difficult to be dewatered. For this reason, each blade 28 of the foil box device 8 is replaced by one having a large foil angle θ, and the lower initial dewatering zone 10 is used. The thickness of the raw material at the entrance of the top wire 11 is maintained by increasing the amount of dewatering, but the large foil angle θ causes rapid dehydration, which deteriorates formation.

The present invention changes the length of the lower initial dewatering zone to an optimum length according to the papermaking conditions in consideration of the arrangement of the foil box device, the foil angle of the blade, the vacuum pressure of the wet suction box, and the like. The purpose is to be able to.

Means for Solving the Problems The present invention provides a top wire moving gantry that supports a top wire on a bottom wire and is movable in the direction of transport of the bottom wire, and restricts the moving position of the top wire moving gantry. The present invention relates to a twin-wire device for a papermaking machine, comprising:

[Operation] The top wire moving device is moved in the direction of transport of the bottom wire, and its position is fixed by the gantry fixing device. Thereby, the length of the lower initial dewatering zone can be arbitrarily set according to the papermaking conditions.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 4 show an embodiment of the present invention, and FIGS.
Parts denoted by the same reference numerals as those in the drawings represent the same items.

As shown in FIGS. 1 and 2, while the top wire 11 is supported on the bottom wire 6 supported by the bottom wire fixing gantry 4 and configured similarly to FIGS. Top wire moving platform that can move in the transport direction
The twin-wire device 52 is configured by providing 29.

The top wire moving gantry 29 is supported on a rail 32 provided on the floor via a wheel 31 provided with a support leg 30 on the operation side at a lower end, and a wheel provided with a support leg 33 on the drive side at a lower end. 31
Provided on the bottom wire fixing stand 4 through the
It is supported on 34 and can be moved along rails 32 and 34 by traveling drive devices 35 and 36 provided on the support legs 30 and 33, respectively. Twin wire 6,11
And a dewatering element 15 for forcibly dewatering the sheet by holding it.

Further, a driving device 37 for driving the top wire roll 12 is mounted on the driving leg 33, and a separator 19 attached to the dewatering element 15 via a dewatering tube 16 is provided on the floor. It is provided so as to be movable on a water channel 20 provided in the main body. The separator 19 is a flexible air pipe.
It is connected to the vacuum source 17 via 39.

Further, the upper member 40 of the top wire moving gantry 29 is extended to the driving side, and a pressing device 41 is provided on the extension portion 40 '. The extension member 40 'can be depressed by pushing the fixing member 42 of FIG.

In the case shown in the figure, the remover block 24 is provided on the support leg 4c on the operation side of the bottom wire fixing gantry 4 and the support leg 30 on the operation side of the top wire moving gantry 29.

Further, the support legs 30, 33 of the top wire moving gantry 29 are provided with a gantry fixing device 43 as shown in FIGS.

That is, an opening 44 that penetrates the support legs 30, 33 in the axial direction of the wheel 31 is provided at an upper position of the wheel 31 provided at the lower ends of the support legs 30, 33, and has an upper portion in the support legs 30, 33. An elevating bar 46, which is raised and lowered by a clamp jack 45, is provided through the opening 44, and is formed in an L-shape at both ends of the elevating bar 46 so that lower ends can be inserted into the lower surfaces of the flanges 47 of the rails 32 and 34, respectively. The clamp arms 48, 49 are rotatably mounted by pins 50, and the clamp arms 48, 49 are connected to each other in the longitudinal middle by an opening / closing cylinder 51.

In the above configuration, for example, when thin paper is to be made, even if the foil angle θ (see FIG. 7) of each blade 28 of the foil box device 8 is reduced, the amount of dewatering in the lower initial dewatering zone is too large and the top wire When the thickness of the raw material 3 at the entrance 11 cannot be maintained, the required number of the foil box devices 8 are removed, and the wet suction box 9 is moved by the interval of the removed foil box devices 8 on the upstream side in the transport direction of the bottom wire 6. Move to
The top wire moving base 29 is also moved to the upstream side.

When moving the top wire moving base 29, the third and fourth
As shown in the figure, after the clamp jack 45 of the gantry fixing device 43 provided on the support legs 30 and 33 is extended to release the clamping of the rails 32 and 34 by the clampers 48 and 49, the traveling drive device 3
After moving to a predetermined position by driving 5, 36, the clamp jack 45 is again reduced to reduce the gantry fixing device.
Fix by 43.

Further, when making thick paper, even if the foil angle θ of each blade 28 of the foil box device 8 is increased, the required amount of dehydration cannot be obtained and the thickness of the raw material 3 at the entrance of the top wire 11 is maintained. When the formation cannot be performed or the formation deteriorates due to rapid dehydration in the initial stage, the top wire moving gantry 29 and the wet suction box 9 are retracted to the downstream side in the same manner as described above, and the retracted wet suction box is moved. By adding a new foil box device 8A between the metal foil 9 and the foil box device 8, the dehydration can be performed slowly without increasing the foil angle θ too much, and the thickness of the inlet material of the top wire 11 can be reduced. Let it be maintained.

According to the above, between the minimum of the lower initial dewatering zone L ₁ of the minimum number of foil box 8, up to the lower initial dewatering zone L ₂ that maximizing the number of additional foil box device 8A In, the lower initial dehydration zone can be arbitrarily set.

In the twin wire device 52 of the present invention, when replacing the bottom wire 6 and the top wire 11, the remover block 24 is removed while the extension 4 a ′ of the bottom wire fixing base 4 is pressed down by the pressing device 22. In a state where the extension portion 40 'of the top wire moving gantry 29 is pressed down by the pressing device 41, the remover block 24 and lower portions of the support leg 30 are removed, and in this state, the bottom wire 6 and the top wire 11 are removed.
Exchange.

At this time, since the pressing device 41 is provided on the extension portion 40 'of the top wire moving base 29, the wire can be replaced regardless of the position of the top wire moving device 29. If the replacement position is set in advance, the pressing device 41 can be provided on the fixing member 42 side.

In addition, the twin-wire device of the papermaking machine of the present invention is not limited to the above-described embodiment, and various configurations can be adopted for the configuration of the gantry fixing device and the like. Of course, various changes can be made without departing from the scope.

[Effects of the Invention] As described above, according to the twin-wire device of the papermaking machine of the present invention, by moving the top wire moving device, the length of the lower initial dewatering zone can be optionally set according to the papermaking conditions. , So that an excellent effect of always maintaining good formation can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view of one embodiment of the present invention, and FIG.
II-II view, FIG. 3 is a front view of the gantry fixing device, FIG. 4 is a IV-IV view of FIG. 3, FIG. 5 is a side view of a conventional twin-wire device, FIG. FIG. 5 is a side view showing an example of a blade of the foil box device, as viewed from the direction of arrows VI-VI in FIG. 6 is a bottom wire, 11 is a top wire, 29 is a top wire moving gantry, 43 is a gantry fixing device, and 52 is a twin wire device.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D21F 1/20 D21F 9/02

Claims (1)

(57) [Claims] 1. A gantry fixing device which supports a top wire on a bottom wire and is movable in the direction of transport of the bottom wire is provided, and a gantry fixing device for restricting a movement position of the top wire gantry is provided. A twin-wire device for a paper machine.