GB2099105A

GB2099105A - Roller for a roller squeezing device

Info

Publication number: GB2099105A
Application number: GB8207164A
Authority: GB
Original assignee: ROBUR WERKE ZITTAU VEB
Current assignee: ROBUR WERKE ZITTAU VEB
Priority date: 1981-05-22
Filing date: 1982-03-11
Publication date: 1982-12-01
Also published as: CH657430A5; DE3205251A1; DE3205251C2; SU1308663A1; DD156542A1; GB2099105B; FR2506409A1; FR2506409B1

Abstract

A core barrel roller for pressure treatment of fabric sheets, paper sheets cardboard or elastomers, comprises a shell consisting of two tubular shell halves (6, 7) of the same size which are pressed on a central support in the form of two frusto- conical surfaces (4, 5), the base surfaces of which face each other, of a core element (1). The ends of the two halves (6, 7) are provided with internal annular mating surfaces (8, 9) and with grooves (10, 11). The mating surfaces (8, 9) contact the frusto- conical surfaces (4, 5). A ring (14) is arranged in the grooves (10, 11) and the ends of the halves (6, 7) are joined by a weld (15). <IMAGE>

Description

SPECIFICATION Roller for a roller squeezing device The present invention relates to a roller for a roller squeezing device, and has particular reference to a core tube roller of a squeezer device for the treatment of preferably textile sheets, also bands of fibres orfibre cables. Such a device may be used, for example, in the finishing of textile sheets and in the manufacture of paper, cardboard or elastomers, that is wherever sheets of materials in the broader sense are to be subjected to a pressure treatment.

It is known, for instance from DE-AS 22 11 892, to provide a core tube roller with a radial support. The roller core tapers in diameter from the region of the central support towards the ends of the roller. Under loading the zone in which the roller core bears internally against the roller shell increases. One variant provides for the roller core to be welded to the roller shell or even form a part of the shell.

This arrangement has a number of disadvantages. If in the region of the support of the shell on the core the transition is not bonded together, fretting corrosion occurs at the contact surfaces, which can lead to a fatigue failure. In addition, tapering of the roller core towards the journal results in a large consumption of material and, in the variant where the taper is curved, additionally in increased machining expenditure.

Moreover, in the intended form of this roller core and its firm connection by shrinking or pressing onto the roller shell, a high notch stress arises. In order to reduce the danger of fatigue failure, a larger roller diameter is necessary. A larger roller diameter, however, substantially reduces the squeezing effect of the squeezer device. The welding of the shell tube onto the roller core, by contrast, obliges the use of a weldable steel for the core, with the disadvantage of the accompanying lower strength of this steel. To enable the loads that arise to be accepted, the diameter of the roller would again have to be increased. This leads to the afore-mentioned disadvantage of reduced squeezing effect. Steels of higher strength are impossible or at least very difficult, however, to weld without giving rise to thermal stress cracking.

Finally, if the roller shell is welded to the roller core, a higher loading occurs at these points, which in turn increases the risk of a fatigue fracture.

There is accordingly a need for a core tube roller for a squeezer device, which roller enables a uniform pressure to be applied over its entire width and which retains the smallest possible diameter.

According to the present invention there is provided a roller for use in a roller squeezing device, comprising a core element having two frusto-conical surface portions arranged with their wider ends facing each other, and an outer sleeve member which is so internally supported in a central region thereof by said surface portions that the ends of the sleeve member are movable relative to the core element under loading of the roller and which comprises two tubular elements of equal size pressing against said surface portions.

In a preferred embodiment, the sleeve member consists of two tubular half-shells of equal size, which are pressed onto a central support having the form of two truncated cones, the base surfaces of which face towards each other.

Preferably, the mutually facing end portions of the two tubular elements are each internally provided with an annular mating surface and in addition with a back-cut groove. The mating surfaces at least approximately correspond to the related surfaces of revolution of the frusto-conical surface portions. A ring is seated in the grooves and the mutually facing ends of the tubular elements are connected together by a weld seam.

An embodiment of the present invention will now be more particularly described by way of example and with reference to the accompanying drawings, in which: Fig. 1 is a schematic partly sectional elevation of a core tube roller according to the said embodiment, together with cqunter-roller; and Fig. 2 is a detail view, to an enlarged scale, of the encircled region of Fig. 1.

Referring now to the drawings, there is shown a core tube roller comprising a roller core 1 having a transition at each of its two ends into a roller journal 2 or 3 respectively. The roller core carries a central support, which has the form of two truncated cones 4 and 5, the base surfaces face towards each other. The outer shell of the core tube roller is formed by two tubular shell halves 6 and 7 of equal size. The mutually facing ends of the two shell halves 6 and 7 are internally provided with annular mating surfaces 8 and 9 respectively and with grooves 10 and 1 The mating surfaces 8 and 9 correspond at least approximately to the related surface of revolution of the truncated cones 4 and 5. The mating surfaces 8 and 9 possess, at their inner edge, relief channels 12 and 13 in order to substantially reduce the notch stresses that occur.The shell halves 6 and 7 are pressed with their mating surface 8 and 9 onto the surfaces of revolution of the truncated cones 4 and 5, respectively. The grooves 10 and 11 serve for seating a ring 14. Finally, the two shell halves 6 and 7 are joined together by a weld seam. The two ends of the roller are closed by means of two resilient sealing rings 1 6 of V-section. For the same of simplicity, this is shown at one end of the roller only. Depending on the loading of the roller, bending or deflection of the roller core 1 takes place to a greater or lesser extent. As a consequence of their cross-section and their resilience, the rings 1 6 keep the two ends closed, independently of the loading on the roller. Since the core 1 is not welded to the shell halves 6 and 7, a steel of appropriate strength, for example St 80, can be selected.

The roller may, in use, co-operate with a counter-roller such as the roller 1 7 in Fig. 1.

A roller substantially as hereinbefore described has a constructional form which may make possible an advanced level of manufacturing engineering. It is ensured that the exacting demands for optimum adaptation to the bending line of the counter-roli in a heavy-duty squeezer mechanism is satisfied across the entire width of the roller. The roller may not only have a long operating life but aiso provide a high squeezing effect. As a result, in the finishing of textiles in subsequent treatment devices there are operating advantages and significant energy savings, for example in the drying of the textile sheet.

Claims

1. A roller for use in a roller squeezing device, comprising a core element having two frustoconical surface portions arranged with their wider ends facing each other, and an outer sleeve member which is so internally supported in a central region thereof by said surface portions that the ends of the sleeve member are movable relative to the core element under loading of the roller and which comprises two tubular elements of equal size pressing against said surface portions.

2. A roller as claimed in claim 1, wherein each of the tubular elements is provided at its end portion facing the respective other tubular element with an internal circumferential surface portion mating with and substantially corresponding in shape to a respective one of said surface portions of the core element.

3. A roller as claimed in ciaim 2, wherein each of the tubular elements is additionally provided at said end portion thereof with an internal annular groove, a ring being arranged in the grooves of the tubular elements and said end portions of the tubular elements being welded together around the ring.

4. A roller substantially as hereinbefore described with reference to the accompanying drawings.