CN1206370A

CN1206370A - Device for de-watering solid-liquid suspensions

Info

Publication number: CN1206370A
Application number: CN 96199391
Authority: CN
Inventors: K·埃克霍夫; P·朔伊谢; G·雷克
Original assignee: Andritz Patentverwaltungs GmbH
Current assignee: Andritz Patentverwaltungs GmbH
Priority date: 1995-11-10
Filing date: 1996-10-31
Publication date: 1999-01-27
Anticipated expiration: 2016-10-31
Also published as: CN1085960C

Abstract

The present invention relates to a device used for de-watering solid-liquid suspensions especially cellulose suspensions, wherein suspensions are de-watered between two filter bands (4, 5) and the de-watering area is a wedge shaped area (10, 11) structure. The wedge height is capable of being adjusted by an adjusting part (14'), especially automatically adjusted such as elastically, at its output terminal, especially within the whole band width.

Description

Be used for equipment that solid-liquid suspensions is dewatered

The present invention relates to a kind of being used for solid-liquid suspensions, the particularly equipment that cellulose suspension is dewatered, wherein, suspension is dehydrated between two strainers, and drying zone is the tapered region structure.

This kind for example in AT 385793 shortcoming of disclosed equipment be that this equipment is very limited setting up when the production bandwidth has the fibrous ribbon of the heavy and dried content that can reach of different sheets.The fixing gap at wedge tail place only allows a heavy scope of little, limited sheet.Wherein, when sheet was great, dried content was just high; Heavy hour of sheet, dried content is just low.Particularly when meeting the material that is difficult to dewater, the too high pressure by wedge tail place makes material flow out from sidepiece.In addition, the too high pressure in the tapered region can damage the side seal device.Along with the heavy increase of sheet, cause pressure to continue to increase and another consequence is: for overcome friction, the required big machine that must make of driving force of machine is out of service.

Therefore; task of the present invention is to provide a kind of equipment, and this equipment also can obtain high dried content when sheet is great, simultaneously; material is flowed out from side direction, do not damage the side seal device again and almost got rid of the danger of shutting down.

According to the present invention, the technical scheme that solves above task is, the wedge height at place, outlet side end is adjustable along whole bandwidth particularly, particularly can be automatically for example elasticity adjust.By the high adjustability of output wedge, can be corresponding sheet and access correct gap heavily respectively.

A preferred form of implementation of the present invention is characterised in that, wedge top or wedge bottom particularly can be automatically for example elasticity adjust.By these derivative strucures, to the high adjustment of wedge other constructional aspect of cooperating equipment best.

A suitable form of implementation of the present invention is characterised in that, by the almost high adjustment of pneumatic element realization wedge of entire machine width setting of one or more edges, wherein, can be used as pneumatic element to flexible pipe or cylinder.Can finish also that wedge is high to be adjusted by the Hydraulic Elements of the almost whole width setting in one or more edges, wherein, can be bellows or flexible pipe or hydraulic cylinder as Hydraulic Elements.By pneumatic or Hydraulic Elements being used to adjust the wedge height at delivery side place, the gap can be able to automatic adjustment by the pressure that occurs.Particularly having along the form of implementation of the flexible pipe of entire equipment stretch wide almost or bellows particularly still can make wedge high adaptive with the sheet heavy phase by wedge under the tilting situation that causes uneven distribution.Because equipment is suitable with at that time concrete situation, pressure oscillation in short-term appears in material or concentrating appears in the bar shaped filter cake or during bulge, equipment still keeps its function.Therefore, equipment has very high functional reliability.

A suitable form of implementation of the present invention is characterised in that wedge top or wedge bottom are flexibly mounted.

A suitable form of implementation of the present invention is characterised in that wedge top and wedge bottom are mechanical connections, and be particularly adjustable on the feed side.By between wedge top and wedge bottom, at mechanical connection towards the side direction of charging gear, the thickness of the filter cake that forms can be subjected to corresponding influence, and also can correspondingly be subjected to the influence of length of the corresponding existence of tapered region to the dehydration of bar shaped material to be drained off.

A suitable form of implementation of the present invention is characterised in that, the maximum of gap or minimum adjustment are limited by backstop.Qualification by maximum is adjusted can guarantee that material is dewatering always, and when minimum is adjusted, avoids infringement equipment when idle running.Adjustment can be carried out according to the variation of lateral seal, makes lateral seal keep its sealing function always.

A suitable form of implementation of the present invention is characterised in that, tapered region extends through first S shape carry-over pinch rolls particularly subsequently always, wherein, according to the deployment scenarios of carry-over pinch rolls, or the part that wedge top or wedge bottom extend through carry-over pinch rolls and opposite extends in the wedge of strainer and carry-over pinch rolls.By this form of implementation, fibrous ribbon is stabilized between the strainer, until entering S shape carry-over pinch rolls, in view of the above, can prevent that thereby fiber from returning back to top and prevent that fiber was extruded from sidepiece before S shape carry-over pinch rolls, in view of the above, can prevent that also filter cake from expanding afterwards and be engaged in humidification again.In view of the above, at first at material, when low dehydration degree material is dewatered, can improve the production capacity of dewaterer to being difficult to dewater.

Major advantage of the present invention is, press the variation that can make the quick adaptive material to be drained off of wedge-type dehydration by changing wedge, therebetween, because under the identical always situation of the pressure of wedge afterbody, dewaterer is and running parameter, variation heavy as sheet, dehydration degree is carried out adaptive automatically, so the influence of weight per unit area in fact do not occur.Particularly extend through S shape carry-over pinch rolls and prevented that material is extruded from the side at afterbody, therefore greatly reduce the susceptibility that dewaterer changes material to be drained off by tapered region.When weight per unit area changed, the aperture that flexibly increases wedge can prevent the dewaterer shutdown.

Below, by accompanying drawing formal specification the present invention with embodiment.Accompanying drawing is depicted as:

Fig. 1 has the sectional view of the dewaterer of tapered region;

Fig. 2 is along the sectional view of the line II-II among Fig. 1;

Fig. 3 is along the sectional view of the line III-III among Fig. 2.

Figure 1 illustrates 3 dehydration equipments 1 with a tapered region 2 and another drying zone, particularly S shape towing area 3.In this dehydration equipment, upper filter screen or strainer 4 are via the adjustable last slewing rollers 6 in its position and be stretched over by in

plate

10 and 11 wedges that constitute via slewing rollers 7 subsequently.Second filter screen or strainer 5 also enter in the wedge via corresponding slewing rollers 8 and another slewing rollers 9.Material to be drained off also is placed in the wedge via charging gear 12 as cellulose.Wedge top 10 and wedge bottom 11 the feed side be by leading screw 13 mechanical connections and its spacing be adjustable.After leaving the gap, strainer 4 and 5 is walked around also continuation dehydration betwixt of S shape carry-over

pinch rolls

21 and 22 together with the cellulose band that is between the strainer 4,5.Herein, Height Adjustment can be carried out by a pneumatic or hydraulic hose 14 in wedge top 10.Supply with compressed air or hydraulic fluid via a joint 15.Stop screw 16 is used for limiting minimum or maximum the adjustment.Piston shoes 17 are used to bear axial force.In addition, also be provided with the support 18 that is used to change the circulation strainer.In order not influence environment as far as possible, cover 19 is integrated with wedge top 10 and filtrate receiver 20 is integrated with wedge bottom 11.At the end of wedge, wedge top 10 has a prolongation 23 that extends through S shape carry-over pinch rolls 21.In view of the above, on the one hand drying zone is prolonged.On the other hand, can prevent that fiber from returning back to top and prevent that fiber from extruding from side direction in the place ahead of S shape carry-over pinch rolls.

Fig. 2 illustrates the sectional drawing of adjusting element 14 ＇.From this figure, can see and propping up by a portion's support 24 and sidepiece 25,25 ＇ by portion.Support 24 is located on the upper profile 26, and this section bar 26 protrudes in and props up the lower profile 27 of fixedlying connected by the bottom 28 of portion.One can be passed through the pneumatic or hydraulic hose of joint 15 supplied with compressed air or hydraulic fluid between upper profile 26 and lower profile 27.According to the pressure in the flexible pipe 14, fixedly connected with wedge top 10 and targeting part 28 can be pressed towards and leans on part 24.The height of wedge is adjusted accordingly according to the pressure in pressure in the wedge and the flexible pipe 14.

Fig. 3 show along the sectional drawing of the line III-III among Fig. 2 and the detailed structure of 3 upper profile 26, lower profile 27 and the flexible pipe between the two 14 is shown and illustrate 3 with on a corresponding situation that is connected by portion 24 and the part 28 that links to each other with wedge top 10.

The invention is not restricted to the embodiment shown in the figure, also can be used for other, as purifying in the strainer formula filter press used in the dehydration at mud.

Claims

1. be used for solid-liquid suspensions, the equipment that cellulose suspension is dewatered particularly, wherein, suspension is dehydrated between two strainers, drying zone is the tapered region structure, it is characterized in that the wedge height at place, outlet side end, be adjustable particularly along whole bandwidth, particularly can be automatically such as flexibly adjust.

2. according to the described equipment of claim 1, it is characterized in that, wedge top particularly can be automatically for example adjustable the and part its opposite of elasticity fix.

3. according to the described equipment of claim 1, it is characterized in that, the wedge bottom particularly can be automatically for example adjustable the and part its opposite of elasticity fix.

4. according to the described equipment of one of claim 1 to 3, it is characterized in that, this adjustment be by one or more edges almost the pneumatic element of entire equipment width setting finish.

5. according to the described equipment of claim 4, it is characterized in that,, be provided with at least one flexible pipe as pneumatic element.

6. according to the described equipment of claim 4, it is characterized in that, be provided with cylinder as pneumatic element.

7. according to the described equipment of one of claim 1 to 3, it is characterized in that, this adjustment be by one or more edges almost the Hydraulic Elements of entire equipment width setting finish.

8. according to the described equipment of claim 7, it is characterized in that,, be provided with at least one bellows or flexible pipe as Hydraulic Elements.

9. according to the described equipment of claim 7, it is characterized in that,, be provided with hydraulic cylinder as Hydraulic Elements.

10. according to the described equipment of one of claim 1 to 9, it is characterized in that wedge top or wedge bottom are flexibly mounted.

11., it is characterized in that wedge top and wedge bottom are mechanical connections in the feed side, and be particularly adjustable according to the described equipment of one of claim 1 to 10.

12., it is characterized in that the maximum adjustment in gap or minimum the adjustment limit by backstop according to the described equipment of one of claim 1 to 11.

13., it is characterized in that tapered region extends through first the particularly S shape carry-over pinch rolls and part on its opposite subsequently and extends in the wedge between strainer and the carry-over pinch rolls according to the described equipment of one of claim 1 to 12.

14., it is characterized in that the part that wedge top extends through carry-over pinch rolls and its opposite stretches in the wedge between strainer and the carry-over pinch rolls according to the described equipment of claim 13.

15., it is characterized in that the wedge bottom extends through carry-over pinch rolls according to the described equipment of claim 13.