WO2016078815A1

WO2016078815A1 - Drier for a material web

Info

Publication number: WO2016078815A1
Application number: PCT/EP2015/072698
Authority: WO
Inventors: Willi Erkelenz
Original assignee: Vits Technology Gmbh
Priority date: 2014-11-17
Filing date: 2015-10-01
Publication date: 2016-05-26
Also published as: EP3221652A1; DE102014116733B3

Abstract

The invention relates to a drier for a web (2) running through, comprising a housing, in which means for drying the web (2) are arranged, wherein openings (3) are formed in longitudinal walls (1a) of the housing, which openings can be closed by means of doors (4), and wherein the doors (4) are supported in a vertically movable manner in guides (5). The problem addressed by the invention is that of improving the drier in such a way that the doors (4) are secure and lastingly tight in the closed state with little complexity. This problem is solved in that each guide (5) is supported in such a way that the guide can be rotated about an axis that is parallel to a longitudinal axis of the guide (5).

Description

Dryer for a web

The invention relates to a dryer for a continuous web, comprising a housing in which means for drying the web are arranged, wherein in the longitudinal walls of the housing openings are recessed, which are closable with doors, and wherein the doors are mounted vertically displaceable in guides.

Such dryers are known per se. They are used to make webs of e.g. Paper or fabric to dry after impregnation and / or coating. The dryer has a housing in which, as means for drying, means for heating, circulation and inflation of drying air are arranged. The drying air is blown onto the web, which in many cases is thereby floating.

In order that visual checks, inspections and cleaning of the dryer are possible, openings are made in the longitudinal walls of the housing and can be closed by doors. The doors are arranged on the outside of the housing. They are vertically displaceable and guided on each broad side by means of bolts in corresponding rails. A gasket is attached to the door, which is guided around the opening with the door closed and against which the door is pressed by gravity and corresponding bending of the rails. In order for the door to be pressed against the seal, the door must be constructed heavier than otherwise structurally required. For putting in the seal wears relatively quickly, because the housing when rubbing and sliding on the seal rubs. This can only be replaced by removing the door. A visual inspection of the seal is relatively difficult.

From DE 203 15 984 U1 a textile treatment plant is known in which doors are mounted vertically displaceable in side walls of the housing. The doors are relatively big and heavy; they require height because they open well above the height of the plant. A secure seal is not guaranteed or feasible only with great effort.

CA 1, 338,382 C describes a vertically operable door for a dryer, which is displaceable in several guides to improve the explosion safety. This door is elaborate.

It is the object of the invention to improve a dryer so that its doors are safe and durable with little effort in the closed state.

The object is solved by the features of claim 1. Each of the guides is rotatably mounted about an axis parallel to a longitudinal axis of the guide. This allows, on the one hand, to press the door in a controlled manner against the housing, with the door is parallel to an associated longitudinal wall of the housing. Thus, for example, a seal over its entire sealing surface uniformly applied with a predetermined pressure, so that a perfect seal between the housing and the door is guaranteed. This is independent of a weight of the door, so that it can be made very easily. On the other hand, before the door is opened, it is moved away from the housing for a certain amount, so that the gasket is not mechanically loaded by friction when it is opened. This significantly increases the life of the seal, so that it must be replaced only if, for example, embrittlement and / or loss of elasticity.

The subclaims relate to the advantageous embodiment of the invention.

In one embodiment, each of the guides is arranged in a straight line on an associated first pipe, which is rotatably mounted about its longitudinal axis. This allows a relatively light, simple and mechanically stable construction. It allows a visually pleasing design of the guide. A drive for opening and closing (raising and lowering) of the door may be arranged in the first pipe.

In a further embodiment, the first tube has a circular cross section. This increases the optical attractiveness and reduces the risk of injury during the rotation of the guides.

In a further embodiment, each of the guides is formed of two second tubes of circular cross-section. Here, the risk of jamming the door is reduced in the guides.

Alternatively, each of the guides is formed of two angle profiles. As a result, a door can be realized with simple means, which complies with the regulations for explosion protection.

In a further alternative, each of the guides is formed of two angle sections and one of the second tubes, and a U-profile fixed to the broad side of the door is guided between legs of the angle sections.

In a further embodiment, a seal is attached to the housing. This can be easily inspected and replaced as needed.

In a further embodiment, a pressurizable cylinder is arranged for rotating the first tube. Hereby, a simply constructed drive is realized. In a further embodiment, a drive for raising or lowering the door is arranged in one of the first tubes. No additional space is needed for the drive, and the visual design is facilitated.

The invention will be further explained with reference to the accompanying drawings. Show it

1 shows a side view of a dryer with three fields,

FIG. 2 shows a plan view from above on a longitudinal wall of a field with the door open, FIG. 3 shows a horizontal section through the longitudinal wall with the door closed,

FIG. 4 shows a detail view of a part of the field,

Figure 5 is a horizontal section through a guide (first example) as a detail

Figure 6 is a horizontal section through a guide (second example) as a detail and Figure 7 is a horizontal section through a guide (third example) as a detail.

As can be seen from Figures 1 to 5, a dryer of a first embodiment is formed here of three identical fields 1, which are modularly assembled one behind the other. The dryer has a cuboid housing with two Längswändel a and on a front broad side of an inlet slot and at a rear broadside an outlet slot for a continuous web 2. The sides are closed except for the slots through walls. The web 2 is in the dryer e.g. floating led. As is known, in each of the fields 1 means for drying the web 2, namely means for circulating and inflating drying air, comprising e.g. a fan and nozzle boxes, and means for heating the drying air, e.g. a burner arranged.

In both longitudinal sides 1 a openings 3 are recessed, each with an associated door 4 is closed. Here, for each of the fields 1 in each of the longitudinal walls 1 a one of the openings 3 is inserted, which extends at the level of the web 2 over a substantial part of a length of the longitudinal wall 1 a. A height of the opening 3 is sized according to the requirements.

Each of the doors 4 is arranged outside the associated opening 3 and overlaps it by a predetermined amount. The door 4 is slidably held in its respective two broad sides, which are mounted in a vertical position, in each case an associated guide 5. For this purpose, at least two flat iron 6 or similar parts such as rails attached to each of the broad sides of the door 4, which protrude into the guide 5. The door 4 is suspended here on two ropes 7, which are retractable by means of a first drive 8, for example a first power cylinder, for opening the door 4. The guide 5 is formed on a first tube 9, as is particularly clear from FIG. The first tube 9 is rotatably mounted about its vertical longitudinal axis, and one each is arranged laterally adjacent to the opening 3. For a rotary drive of the first tube 9, for example, a second power cylinder 10 is provided, which engages a fixed to the first tube 9 eccentrically arranged axle bolt. The rotary drive is formed either separately for each first tube 9 or in pairs for the one of the doors 4 associated first tubes 9.

Outside on a lateral surface of the first tube 9 as the guide 5, two second tubes 1 1 are fixed so that the longitudinal axes of all tubes 9, 1 1 extend parallel. A mutual distance of the second tubes 1 1, which have a circular cross-section, is dimensioned so that the flat iron 6 with a small clearance between the two second tubes 1 1 are guided tangentially to these. The second tubes 11 extend substantially the entire length of the first tube 9 and are e.g. welded to this.

The two guides 5 associated with a door 4 are aligned in such a way that they face each other substantially. A connecting line of the guides 5 thus runs parallel to the longitudinal wall. 1 a.

For airtight seal between the door 4 and the longitudinal wall 1 a is arranged around the opening 3, a seal in the form of a sealing strip 12 which is fixed to the housing, in particular to the support frame. The weather strip 12 is made of elastic material, e.g. Made of silicone and has a substantially rectangular cross-section, wherein a side facing the door 4 is convexly curved.

Above the opening 3 is spaced apart in front of the longitudinal wall 1a a not shown facing arranged, the e.g. is formed in the form of a sheet. The clear distance between the longitudinal wall 1 a and the veneer is dimensioned so that the door 4 is hidden when opened in the intermediate space thus formed. The veneer has safety advantages because it covers drive parts such as the ropes 7 and the mechanism of the rotary drive and so z. the risk of bruising at least diminished. In addition, the appearance of the dryer can be improved.

To open the door 4, the second power cylinder 10 is operated so that the door 4 is removed from the longitudinal wall 1a by the guides 5 for a predetermined amount. As a result, the door 4 is lifted from the sealing strip 12. Subsequently, the first power cylinder 8 is actuated and the door 4 is thereby raised above the ropes 7 so far that the opening 3 is at least partially released. As a result, observations, inspections and / or maintenance and cleaning work are possible.

To close the door 4, the first power cylinder 8 is operated so that the door 4 controlled by gravity drops to a height-adjustable stop. Once the target position of the door 4 is reached in front of the opening 3, the second power cylinder 10 is operated so that the rotary drive moves the door 4 for a predetermined amount in the direction of the longitudinal wall 1 a. In this way, a desired pressure of the door 4 is generated against the sealing strip 12 and ensures the required seal.

In a second embodiment of the invention, which is shown in Figure 6, the guide 5 and the associated holder of the door 4 are designed for a (according to the regulations) explosion-proof design of the dryer. This second embodiment differs from the previously described one by the following:

Outside on a lateral surface of the first tube 9 as the guide 5 two angle sections 13 are strengthened. Longitudinal axes of the first tube 9 and the angle sections 13 are parallel. Each of the angle sections 13 has in cross section two legs arranged at right angles. A longer one of the legs is attached to the first tube 9 so that ends of shorter ones of the legs are opposed by a predetermined distance and thus form a slot. The longer legs are parallel, and outer surfaces of the shorter legs are in one plane. At the door 4 T-profiles 14 are instead of the flat iron 6 here fastened so that their straps are mounted in the guides 5.

In the case of an explosion, the door 4 is securely held in the guides 5, even if deformed by bending or buckling.

A third embodiment of the invention, which is shown in Figure 7, the guide 5 and the associated holder of the door 4 are also designed for (according to the regulations) explosion-proof design of the dryer. This third embodiment differs from the first one by the following:

Outside on the lateral surface of the first tube 9, only a single of the second tubes 1 1 is fixed so that the second tube 1 1 is disposed on a slightly oblique to the opening 3 facing radial beam of the first tube 9. Furthermore, 9 two rectangular angle sections 13 are arranged on the lateral surface of the first tube. A first of these angle sections 13 is fixed at a predetermined distance from the second tube 1 1 such that its longer leg has tangentially on the first tube 9 of the associated longitudinal wall 1 a of the dryer away and its shorter leg to the first tube. 9 has. The first angle section 13 is welded at its free ends to the first tube 9. The second angle section 1 1 is fixed with its longer leg to the first tube 9 and the shorter leg of the first angle section 1 1, that the legs mentioned here are parallel and the shorter leg of the second angle section to the longitudinal wall 1 a points. In this way, a channel-like channel is formed between the longer leg of the first and the shorter leg of the second angle section 1 1.

At each broad side of the door 4, a U-profile 15 is fixed so that its opening to the outside, ie away from the longitudinal wall 1 a, points. A leg of the U-profile 15 remote from the broad side is guided in the channel.

With the execution of the third example, on the one hand (in accordance with the regulations) explosion-proof design of the dryer is given; possible wear of the weather strip 12 can be safely compensated to the wear limit.

LIST OF REFERENCE NUMBERS

1 field

1 a longitudinal wall

2 train

3 opening

4 door

5 leadership

6 flat iron

7 rope

8 first power cylinder

9 first pipe

10 second power cylinder

1 1 second pipe

12 sealing strips

13 angle profile

14 T-profile

15 U-profile

Claims

claims

1 . Dryers for a continuous web (2),

with a housing in which means for drying the web are arranged,

wherein in longitudinal walls (1 a) of the housing openings (3) are recessed, which are closable with doors (4),

wherein the doors (4) are mounted vertically displaceable in guides (5),

characterized in that each of the guides (5) is rotatably mounted about an axis parallel to a longitudinal axis of the guide (5).

2. Dryer according to claim 1, characterized in that each of the guides (5) is arranged in a straight line Shen on an associated first tube (9), which is around its

Longitudinal axis is rotatably mounted.

3. Dryer according to claim 2, characterized in that the first tube (9) has a circular cross-section.

4. Dryer according to one of claims 1 to 3, characterized in that each of the guides (5) consists of two second tubes (1 1) is formed with a circular cross-section.

5. Dryer according to one of claims 1 to 3, characterized in that each of the guides (5) consists of two angle sections (13) is formed, between which a T-profile (14) is guided.

6. Dryer according to one of claims 1 to 3, characterized in that each of the guides (5) consists of two angle sections (13) and one of the second tubes (1 1) is formed, and that on the broad side of the door (4) fixed U-profile (15) between legs of the angle sections (13) is guided.

7. Dryer according to one of claims 1 to 6, characterized in that a seal (12) is fixed to the housing.

8. Dryer according to one of claims 1 to 7, characterized in that for rotating the guide (5), a second power cylinder (10) is arranged.

9. Dryer according to one of claims 1 to 8, characterized in that a first power cylinder (8) for raising or lowering the door (4) in one of the first tubes (9) is arranged.