A kind of device that adds dilution water coarse adjustment and fine adjustment for paper cross direction ration
Technical field
The present invention relates to the head box of paper machine, in particular, relate to a kind of device that adds dilution water coarse adjustment and fine adjustment for paper cross direction ration.
Background technology
Now, along with the continuous development of paper detection apparatus, market has proposed more and more higher requirement for the cross direction ration level distribution of paper.The dilution water decanting point spacing of dilution water head box is approximately between 32mm~75mm, generally about 60mm, do dilution water if adopt the plain boiled water that comprises fiber, spacing can not be littler so, because too small caliber can cause the obstruction of dilution water arm, and big slightly arm can't be installed between closeer tube bank.
U.S. Pat 6808601B1 has proposed a kind of device, to dilute two sections of moisture adds in the head box, first section, the dilution water arm is installed in into after the slurry house steward, link to each other with the tube bank of cloth slurry, according to the requirement of paper cross direction ration control, dilution water passes through control valve, join on the horizontal respective point of head box, bigger at interval along the decanting point of the horizontal dilution water of head box; Second section, the dilution water arm is installed in after the medial compartment, link to each other with turbulent flow generator, dilution water with mix through the slurry after first section adjusting stream, its decanting point along the horizontal dilution water of head box is littler than first section at interval.But two problems are arranged, what added in the one, second section trim process is the very little dilution water of solid content, and its addition is few, but still can flow is inequality to produce crossing current owing to each strand slurry flows, thereby influence the fiber orientation of regulating effect and paper in turbulent flow generator outlet; Its two, in second section, the dilution water arm still will be installed between the arm of turbulent flow generator, its installation is subjected to the influence that turbulent flow is propped up tube pitch, and has increased the difficulty of processing and manufacturing.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, provide a kind of and can effectively prevent the slurry crossing current that in head box, produces owing to add dilution water, effect and the interpolation dilution water coarse adjustment of control accuracy and the device of fine adjustment for paper cross direction ration that improves dilution water adjusting cross direction ration.
Device of the present invention is connected and composed successively by dilution water house steward, dilution water control valve, dilution water arm and dilution water module, the dilution water module be installed in head box advance to starch between the tube bank of house steward and cloth slurry, described dilution water house steward, dilution water control valve and dilution water arm all have two covers, a shared dilution water module, one cover is formed dilution water coarse adjustment system, another set of composition dilution water micro-tensioning system.
Described dilution water module is made of along head box is transversely arranged the identical dilution unit of a plurality of physical dimensions, the inlet height of dilution water module depends on slurry house steward's into the open height that goes out, and exit width and other size depend on that control requires and the arrangement situation of tube bank;
Each dilution unit is divided into two joints, and each joint of dilution unit is formed by stock inlet, mixer, grout outlet and dilution water inlet, and stock inlet symmetry gradually is contracted to the import of mixer, then again by the outlet of mixer gradually symmetry be extended to grout outlet;
Preferred version: the stock inlet and the grout outlet of described dilution unit first segment are rectangle, has identical size, height equates with the open height that goes out that head box advances to starch house steward, width depends on the spacing of dilution water decanting point and the arrangement situation of cloth slurry tube bank, can equal the width of two row or multiple row tube bank, the cross section of described mixer can be hole shape, square or other polygon, and length is about 1/3 of first segment length, and the aperture is about Φ 20mm during for hole shape;
The dilution water inlet of described dilution unit first segment is positioned at the top of dilution water module, between the import of stock inlet and mixer, link to each other with the dilution water arm of coarse adjustment system, dilution water becomes 0 °~90 ° to enter in the dilution water module with main slurry stream, and the main slurry stream next with advancing to starch house steward mixes;
The stock inlet and the grout outlet of second joint of described dilution unit are rectangle, has identical size, height equates with the open height that goes out that head box advances to starch house steward, width is generally equal to the width of a tubulation bundle, the cross section of described mixer can be hole shape, square or other polygon, length is about 1/3 of the second joint length, and the aperture is about Φ 20mm during for hole shape;
The dilution water inlet of second joint of described dilution unit is positioned at the top of dilution water module, between the import of each unit stock inlet and mixer, link to each other with the dilution water arm of micro-tensioning system, dilution water becomes 0 °~90 ° to enter in the dilution water module with main slurry stream, and mixes with the main slurry stream of process first segment coarse adjustment.
During work, two sections of moisture of dilution add head box, and first section dilution water adds the front end of dilution water module by the coarse adjustment system, and second section dilution water is by micro-tensioning system adding dilution water module rear end.The scope of first section thinner ratio is 5%~15%, can adopt plain boiled water; The scope of second section thinner ratio is 3%~8%, can adopt the plain boiled water of plain boiled water, clear water or clarification, and second section addition is smaller.
Compared with prior art, the invention has the beneficial effects as follows: (1) two section dilution water in the dilution water module before the tube bank of cloth slurry, thereby guarantees that the slurry flow that enters cloth slurry element and the every tubulation of turbulent flow generator equates, has avoided crossing current after all injecting and being positioned at into the slurry house steward; (2) the dilution water arm is installed in the top of dilution water module, can choose bigger caliber as required, has avoided the obstruction of dilution water arm, makes second section can adopt plain boiled water to make dilution water; (3) processing and fabricating is simple, and equipment cost is low.
Application example
Fig. 1 is to use the structural representation of the head box of apparatus of the present invention;
Fig. 2 is the A-A profile of Fig. 1;
Fig. 3 is the D place enlarged drawing of Fig. 2;
Fig. 4 is the B-B profile of Fig. 2;
Fig. 5 is the C-C profile of Fig. 2;
Fig. 6 is the E-E profile (dilution water module) of Fig. 3.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing, but the invention is not restricted to this.
As shown in Figure 1, dilution moisture adds in the head box for two sections, head box comprises dilution water coarse adjustment system and dilution water micro-tensioning system, dilution water coarse adjustment system is made of dilution water house steward 1, control valve 2, dilution water arm 3 and dilution water module 4, and the dilution water micro-tensioning system is made of dilution water house steward 7, control valve 6, dilution water arm 5 and dilution water module 4.
Dilution water house steward (1,7) is a conical pipe, and the flow and the pressure that can guarantee to enter dilution water arm (3,5) are equal fully.The shared dilution water module 4 of two cover dilution water add-on systems, first section coarse adjustment dilution water injects the front end of dilution water module 4, second section fine setting dilution water injects the rear end of dilution water module 4, and head box advances to starch house steward 8 and the cloth slurry is restrained between 9 and dilution water module 4 is installed in.
As shown in Figure 2, dilution water module 4 is made up of a plurality of dilution unit, and each unit is divided into two joints again, and first segment 4-1 advances to starch house steward 8 with taper and links to each other, and the second joint 4-2 then links to each other with cloth slurry tube bank 9.
The diameter of cloth slurry tube bank 9 each pipe is Φ 18mm, centre-to-centre spacing is 30mm, the slurry concentration of adjacent two tubulation bundles is controlled in design by coarse adjustment system dilution water module 4 each unit first segment 4-1, the slurry concentration of micro-tensioning system dilution water module 4 each unit second each component controls one tubulation bundle of joint 4-2, so dilution water module 4 each unit second joint 4-2 have two identical parts, the corresponding tubulation bundle of each parts, and have the width that is not less than every tubulation bundle outlet.Therefore the exit width of dilution water module 4 each unit first segment 4-1 should be greater than 48mm, consider the wall thickness between each unit, the width of each parts can be 60mm, its inlet height then equals the open height that goes out that taper advances to starch house steward 8, the outlet of each unit first segment 4-1 can comprise the import of two parts of the second joint 4-2 fully like this, has just comprised the import of two tubulation bundles fully.The unit number of forming dilution water module 4 is half of whole cloth slurry tube bank columns.
As shown in Figure 3, the first segment 4-1 of dilution water module 4 each unit is made up of the dilution water import 4-1-4 of stock inlet 4-1-1, mixer 4-1-2, grout outlet 4-1-3 and first section, and second each parts of joint 4-2 also are made up of the dilution water import 4-2-4 of stock inlet 4-2-1, mixer 4-2-2, grout outlet 4-2-3 and second section.It can also be seen that from figure the second joint 4-2 is made up of two identical parts, the corresponding tubulation bundle of each parts, and first segment 4-1 is made up of parts, its outlet has comprised the import of two parts of the second joint 4-2.
As shown in Figure 4, each component width of dilution water module first segment 4-1 is 60mm, and the dilution water arm 3 that is used for coarse adjustment is installed in the middle of dilution water module 4 each unit first segment 4-1, and its spacing is 60mm.
As shown in Figure 5, the width of dilution water module 4 each unit second each parts of joint 4-2 is 30mm, and the dilution water arm 5 that is used to finely tune is installed in the middle of dilution water module 4 each unit second each parts of joint 4-2, and its spacing is 30mm.
Fig. 6 cuts open the profile of the resulting dilution water module in back through rotation for Fig. 3, as can be seen from the figure, the coarse adjustment dilution water import 4-1-4 of first segment 4-1 is between the stock inlet 4-1-1 and mixer 4-1-2 of first segment 4-1, the fine setting dilution water import 4-2-4 of second each parts of joint 4-2 is between the stock inlet 4-2-1 and mixer 4-2-2 of the second joint 4-2, and dilution water and main slurry stream are all gone between the stock inlet (4-1-1,4-2-1) and mixer (4-1-2,4-2-2) of each joint into about 80 ° of subscripts.Mixer all is tubular, and the diameter of first segment mixer pipe is Φ 20mm, and length is 30mm, and the diameter of the second joint mixer pipe is Φ 10mm, and length is 10mm, also can select different pipe ranges and caliber and mixer shape as required.
Operation principle of the present invention is as follows: the first segment 4-1 that is introduced into the dilution water unit by the slurry that advances to starch house steward 8, after mixing, dilution water with the coarse adjustment system enters among the second joint 4-2 of unit, mixes with the dilution water that micro-tensioning system is come again in the second joint 4-2 through the slurry after the preliminary concentration adjustment, just enter the cloth slurry through the slurry after twice concentration adjustment and restrain in 9.In the whole system, distribute according to the horizontal quantification of paper by control valve (2,6) along the addition of the horizontal difference of head box and to regulate, elder generation's coarse adjustment is finely tuned again, because the spacing 30mm of second section fine setting dilution water decanting point, less than the dilution water spacing (being generally 60mm) of conventional head box, thereby can obtain the cross direction ration distribution effect more better than the dilution water head box of routine.