CH684846A5 - Sealing plate for rotor-molding machines. - Google Patents

Description

1

CH 684 846 A5

2nd

description

The invention relates to a sealing plate for rotor spraying machines which are used for conveying shotcrete, and to the concrete spraying machine provided with such a sealing plate, as defined in the patent claims.

Two different methods are used for concrete spraying: dry or wet method. In the drying process, the oven-dried or earth-moist mixture of sand, cement and possibly gravel is filled into the spraying machine and pneumatically conveyed through the delivery line to the spray nozzle using compressed air. It is there that the mixing water is added via a second hose line. The spray effect is achieved by the existing compressed air.

So-called rotor machines are the most widespread for dry spraying. With this type of machine, the dry mixture is fed from the discharge hopper into the pressurized delivery line using a rotor. The rotor has several rotor chambers and is continuously rotated horizontally by the drive motor. On one side of the rotor, the chambers are filled from the top of the feed hopper without pressure via gravity. Due to the rotary movement, the rotor chambers pass through an outlet. With the help of compressed air, the chambers are emptied down into the delivery line. The rotor chambers are now rotated further for refilling. Before this is possible, the remaining pressure in the rotor chambers must be released. This happens with the so-called exhaust. Such rotor machines are e.g. described in DE-PS 3 130 682.

To adapt to different conveying materials and to achieve different conveying capacities, differently sized rotors are used in terms of height, chamber shape and number of chambers. Appropriate sealing plates are required for all rotor types (upper and lower sealing plates), which on the one hand allow loading by gravity from above and on the other hand seal the rotor chambers under compressed air until the material is emptied towards the bottom. The sealing plates are made of an elastic material, which have openings for filling and emptying the material or for adding and relieving compressed air at the appropriate points. In order to prevent material from entering between the sealing plate and the friction disks attached to the upper and lower side of the rotors, the openings for filling (upper sealing plate) or, for certain producers, for emptying (lower sealing plate) are closed so-called protective bracket installed in the sealing plate. These guards are made of hard and resistant materials and prevent material from getting under the seal.

The protective bracket can only prevent material from getting between the sealing plate and the friction disc if it does not stand on the friction disc. In this case, the surrounding elastic material could not perform its sealing function against the rotor. Since the surface of the sealing plate, which is made of elastic material, gives way when tensioning (= closing), the protective bar must be set a minimum (0.2-0.3 mm) lower.

Sealing plates are a relatively expensive wearing part. A long service life is therefore crucial. Sealing plates can be reground several times. For the optimal positioning of the protective bar, it would be necessary to remove it in each case, sand it down compared to the grinding of the elastic material and then reinsert it. However, this is very cumbersome and labor-intensive, which is why it is usually not done.

With the present invention, this old problem is now solved in an impressively simple manner. The protective bracket is not screwed directly onto the sheet of the sealing plate, but is underlaid with an elastic intermediate layer. This causes the protective bar to yield in accordance with the surrounding elastic material when tensioned. If it is still necessary to lower the safety bar, you can simply tighten the corresponding fastening screws.

The elastic intermediate layer can be made of any material that yields sufficiently when screwed on. This material preferably has the same hardness as the material used for the protective bar.

The invention will be explained in more detail with reference to the drawings, wherein

Fig. 1 represents an upper and lower sealing plate as a whole and

Fig. 2 shows in detail the arrangement of the protective bar with a rubber pad.

In these drawings, the reference numerals refer to the following parts:

A rubber sealing plate 1 rests on a sheet metal disc 2. In the middle of this sealing plate there is a recess 3 for the drive shaft of the rotor. In the upper sealing plate there is a further recess 4 for feeding the rotor chambers with material and in the lower sealing plate a further recess 5 for emptying the rotor chambers. In the recess 4, the protective bracket 6 is attached, which in turn rests on an elastic intermediate layer 7 and a base plate 8 and is screwed down with a fastening 9.

Claims (3)

Claims 1. Sealing plate for rotor spraying machines, characterized in that the protective bracket (6) rests on an elastic intermediate layer (7). 2. Sealing plate according to claim 1, characterized in that the protective bracket by means of 5 10th 15 20th 25th 30th 35 40 45 50 55 60 65 2nd 3. concrete spraying machine of the rotor type, characterized in that it is provided with a sealing plate according to claim 1 or 2. 5 10th 15 20th 25th 30th 35 40 45 50 55 60 65 3rd 3rd CH 684 846 A5 Stigung (9) is screwed onto a support plate (8).