GB1561840A

GB1561840A - Dewatering assembly for mounting on a dewatering machine

Info

Publication number: GB1561840A
Application number: GB4599376A
Authority: GB
Original assignee: SOTEC AG
Current assignee: SOTEC AG
Priority date: 1975-11-04
Filing date: 1976-11-04
Publication date: 1980-03-05
Also published as: DE2650343C2; ATA840275A; AT343456B; DE2650343A1

Description

(54) A DEWATERING ASSEMBLY FOR MOUNTING ON A DEWATERING MACHINE (71) We, SOTEC AG., a Swiss Company, of Kusnacht-Ziirich, 148 Ztin.cher- strasse, Switzerland, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed ,to be particularly described in and by the following statement: This invention relates to a dewatering assembly for mounting on a dewatering machine.

It is frequently necessary in dewatering machines to remove the dewatering elements for cleaning, and it is desirable that this should be possible without stopping the machine.

According to the present invention there is provided a dewatering assembly for mounting on a dewatering machine, the assembly comprising a dewatering element on a support made of metal and a mounting bar, also of metal and adapted to be secured on the machine, the bar having a T-shaped upper portion, and the element support having a C-shaped lower portion adapted to slide onto the T-shaped portion, the assembly being arranged with a waterrepellent, swelling-resistant synthetic plastics material between the two portions to prevent direct contact between the element support and the mounting bar, and the element having a rounded corner at least at one end of the working edge.

This construction avoids any risk of rust development, oxidation or corrosion between the two adjacent metal surfaces of the mounting bar and element support. Since the synthetic plastics material is water repellent and swelling-resistant, the dewatering element and its support can at all times be slid along the mounting bar so that the dewatering element can be removed for cleaning without having to stop the machine.

The provision of a-rounded corner at the ends of the working edge of the dewatering element assists in avoiding any damage to the web material being dewatered. The provision of the synthetic p]astics material between the support and the bar reduces friction between them.

The support can advantageously be made from aluminium, whilst the mounting bar may be made from a metal such as steel, brass or bronze. It will be clear that if these different metals were in contact, galvanic corrosion would result. This would hinder mutual sliding of the support and the mounting bar.

The synthetic plastics material may be simply strips arranged between the engaging C- and T-shaped portions of the element support and bar respectively, in such a way as to keep the bar and the support out of contact with each other.

Alternatively, a pair of U-shaped strips may be mounted one over each end of the cross-piece of the T-shape, and of sufficient thickness to maintain the support and the bar out of contact. In a futher alternative arrangement, a C-shaped synthetic plastics strip can be arranged over the top and around both ends of the cross-piece of the T-shape.

Thc synthetic plastics material is preferably high molecular weight low pressure polyethylene.

The invention can be applied to dewatering elements such as foils, deflectors and supporting tables in pulp dewatering machines. The assembly is also suitable for flat suction apparatuses, wet suction apparatuses and sieve tables. In all these components of pulp dewatering machines, the dewatering elements extend over the whole width of the machine and can easily be pulled off the T-shaped bar.

The invention will now be further described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a perspective view of a de watering assembly according to the invention; Figure 2 is a cross-section through the assembly of Figure 1; Figure 3 is a cross-section through a second embodiment of an assembly according to the invention; and Figure 4 is a view of the assembly of Figure 2 taken in the direction of the arrow VI-.

In Fig. 1, the mounting bar 1 having a T-shaped profile is stationarily arranged on a machine. 2 is a profiled support for the dewatering elements 3 consisting of oxide ceramics such as aluminium oxide or silicon carbide or of synthetic plastics material.

These elements 3 have dovetail grooves 4.

These dovetail grooves 4 form cavities 6 together with grooves 5 of the support 2 These cavities 6 are filled with a filler compounnd 6', for example an epoxy resin, which fills the dovetail grooves 4 and thus firmly connects the elements 3 with the support 2.

The support 2 comprises at its bottom side downwardly directed legs 7 which extend inwardly to form a C-shaped profile.

When the support 2 is positioned on the mounting bar 1, there is a space between the C- and T-shaped profiles.

According to the embodiment shown in Fig. 1 an insert 9 of synthetic plastics material and having a C-shaped crosssection is arranged between the cross-piece 8 of the T-shaped and the C-shaped crossof the support 2. The C-shaped profile of the support 2 is now, with interposition of the insert 9, slid over the T-shaped mounting bar 1. Since the insert 9 extends along the top and around the ends of the crosspiece of the T-shape no portion of the C-shaped profile of the support 2 is in direct contact with the bar 1.

Fig. 2 shows the embodiment described with reference to Fig. 1 in cross-section.

The reference numerals remain unchanged, as in the following Figures of the drawing.

Fig. 3 shows a cross-section through an arrangement in which the ends of the crosspiece 8 of the T-shape are embraced by two inserts 10 having U-shaped cross-section.

The top of the bar 1 is kept free between the T-shaped and the C-shaped profiles. The top of the bar 1 having T-shaped crosssection is, however, spaced from the inner surface of the C-shaped profile of the support 2 by means of the legs 11 of the inserts 10 so that also in this case, direct contact is avoided between the metal forming the bar 1 and the support 2.

Fig. 4 shows the dewatering assembly in a view as seen in the direction of arrow VI of Fig. 2. The edges of the element 3 to be in contact with the sieve or felt 14 are as is shown at 13, rounded at the ends i5 of the working edge.

WHAT WE CLAIM IS:- 1. A dewatering assembly for mounting on a dewatering machine, the assembly comprising a dewatering element on a support made of metal and a mounting bar, also of metal and adapted to be secured on the machine, the bar having a T-shaped upper portion, and the element support having a C-shaped lower portion adapted to slide onto the T-shaped portion, the assembly being arranged with a waterrepellent, swelling-resistant synthetic plastics material betwen the two portions to prevent direct contact between the element support and the mounting bar, and the element having a rounded corner at least at one end of the working edge.

2. An assembly as claimed in claim 1, wherein strips of synthetic plastics material are arranged between the C- and T-shaped portions.

3. An assembly as claimed in claim 2, wherein a pair of U-shaped strips of synthetic plastics material are provided around the ends of the cross-piece of the T-shape.

4. A assembly as claimed in claim 2, wherein a C-shaped strip of synthetic plastics material is provided along the top and around the ends of the cross-piece of the T-shape.

5. An assembly as claimed in any preceding claim, wherein the synthetic plastics material is high molecular weight, low pressure polyethylene.

6. A dewatering assembly substantially as herein described with reference to any one embodiment shown in the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. watering assembly according to the invention; Figure 2 is a cross-section through the assembly of Figure 1; Figure 3 is a cross-section through a second embodiment of an assembly according to the invention; and Figure 4 is a view of the assembly of Figure 2 taken in the direction of the arrow VI-. In Fig. 1, the mounting bar 1 having a T-shaped profile is stationarily arranged on a machine. 2 is a profiled support for the dewatering elements 3 consisting of oxide ceramics such as aluminium oxide or silicon carbide or of synthetic plastics material. These elements 3 have dovetail grooves 4. These dovetail grooves 4 form cavities 6 together with grooves 5 of the support 2 These cavities 6 are filled with a filler compounnd 6', for example an epoxy resin, which fills the dovetail grooves 4 and thus firmly connects the elements 3 with the support 2. The support 2 comprises at its bottom side downwardly directed legs 7 which extend inwardly to form a C-shaped profile. When the support 2 is positioned on the mounting bar 1, there is a space between the C- and T-shaped profiles. According to the embodiment shown in Fig. 1 an insert 9 of synthetic plastics material and having a C-shaped crosssection is arranged between the cross-piece 8 of the T-shaped and the C-shaped crossof the support 2. The C-shaped profile of the support 2 is now, with interposition of the insert 9, slid over the T-shaped mounting bar 1. Since the insert 9 extends along the top and around the ends of the crosspiece of the T-shape no portion of the C-shaped profile of the support 2 is in direct contact with the bar 1. Fig. 2 shows the embodiment described with reference to Fig. 1 in cross-section. The reference numerals remain unchanged, as in the following Figures of the drawing. Fig. 3 shows a cross-section through an arrangement in which the ends of the crosspiece 8 of the T-shape are embraced by two inserts 10 having U-shaped cross-section. The top of the bar 1 is kept free between the T-shaped and the C-shaped profiles. The top of the bar 1 having T-shaped crosssection is, however, spaced from the inner surface of the C-shaped profile of the support 2 by means of the legs 11 of the inserts 10 so that also in this case, direct contact is avoided between the metal forming the bar 1 and the support 2. Fig. 4 shows the dewatering assembly in a view as seen in the direction of arrow VI of Fig. 2. The edges of the element 3 to be in contact with the sieve or felt 14 are as is shown at 13, rounded at the ends i5 of the working edge. WHAT WE CLAIM IS:-

1. A dewatering assembly for mounting on a dewatering machine, the assembly comprising a dewatering element on a support made of metal and a mounting bar, also of metal and adapted to be secured on the machine, the bar having a T-shaped upper portion, and the element support having a C-shaped lower portion adapted to slide onto the T-shaped portion, the assembly being arranged with a waterrepellent, swelling-resistant synthetic plastics material betwen the two portions to prevent direct contact between the element support and the mounting bar, and the element having a rounded corner at least at one end of the working edge.