FI128167B - Vertical lift door - Google Patents

Abstract

The lifting mechanism for lifting the door comprises a first shaft (20a) having first coils (22a) for mounting means for wrapping on the first coils and at least one first motor (28a) for rotating the first axis. The lifting mechanism further comprises at least one second axis (20b) adjacent to the first axis at a distance from the first axis. One shaft has second coils (22b) for hanging members wrapping on the other coils. The suspension members are preferably lifting ropes (24). Preferably, the first axis and the second axis are coupled to each other by at least one synchronizing shaft rotation synchronizer (30).

Description

The invention relates to a lifting door having a door leaf, a lower beam and a lifting mechanism for lifting and lowering the leaf, the lifting mechanism comprising a first axis having first coils for hanging means for wrapping on first coils, such as lifting wires wound on the first coils. the first reaching into the lower beam, and rotating the first axis of the at least one first motor.

Fabric lifting doors are commonly used as dividers for production spaces and halls, and as doors for hallways and plant entryways. Double-skinned fabric lift doors have inner and outer fabric with transverse horizontal stiffeners. At the top of the lift door is the door lift mechanism and its associated motor. At the bottom of the lifting door is a lower beam which is connected to the lifting mechanism by at least two lifting straps or wire running between the inner and outer fabric. The vertical edges of the toοεί 5 to door have edge rails that control the linear movement of the horizontal stiffeners and the ends of the lower beam. The lifting door is opened by lifting the lower beam upwards by means of a lifting mechanism, whereby the horizontal stiffeners accumulate on the lower beam and the inner and outer fabric folds on different sides of the lower beam. Similarly, the lifting door is closed by lowering the lower beam on the lifting slings or ropes against the lower edge of the opening 20.

Fabric lift doors are typically large in size. For example, a lifting door serving as a hangar door can have a surface area of thousands of square meters and a weight of tens of tons. The width of the door leaf can easily be tens of meters, whereby the horizontal stiffeners of the door leaf are subjected to high bending stress due to wind pressure. Therefore, the horizontal stiffeners must be made very wide in order to obtain sufficient bending strength. The horizontal stiffener of a large lifting door can have a width of 1.0-2.5 meters.

In known fabric lift doors, the lifting mechanism comprises a single shaft having a plurality of coils for hanging members supporting the lower beam, such as ropes or lifting straps. The shaft and the suspension members are located in the depth direction of the door leaf on the center line of the door leaf 30, i.e. halfway down the width of the horizontal stiffeners. Particularly in large, thick doors, horizontal stiffeners can tilt when the door is raised and lowered, causing premature wear on the stiffeners at the ends of the horizontal stiffeners and making the door sound. In coils arranged on a single shaft, the tensile stress on a single suspension member is high, which results in an increase in the size of the suspension member and the coil.

20165779 prh 11-10-2019

DE 202015000252 LH and EP 2947256 A1 describe a lifting door having a door leaf and a lifting mechanism for raising and lowering the door leaf.

It is an object of the invention to provide a lifting door which can reduce the drawbacks and disadvantages of the prior art.

The objects of the invention are achieved by a lifting door which is characterized by what is disclosed in the independent claim. Certain preferred embodiments of the invention are set forth in the dependent claims.

The lifting door according to the invention has a door leaf, a lower beam and a lifting mechanism for raising and lowering the door leaf. The lifting mechanism comprises a first 10 axle having first coils for hanging members winding on the first coils, such as lifting ropes, which are fastened on their first end to a lower beam, and at least one first motor for rotating the first axis. The lifting mechanism further comprises at least one second axle adjacent to the first axis at a distance from the first axis, the second axis having second coils for hanging members, such as lifting ropes, which are wound on the other coils. The hanging members wrapping on the second coils are attached at their first end to the lower beam at a distance from the hanging members of the first coil. The number of shafts can be selected, for example, based on the total weight of the lift door and / or the thickness of the 20 door leaf. Preferably, the lifting door is a two-cloth foldable fabric lifting door.

A preferred embodiment of the lifting door according to the invention further comprises at least one second motor for rotating the second axis. The shaft length is typically selected such that the shaft length is substantially equal to the width of the door leaf. The shaft length can then be several tens of meters. Especially on long shafts, it is often convenient to use multiple motors to rotate the shaft so that the power, size and weight of the motors remain reasonable.

In another preferred embodiment of the lifting door according to the invention, said first shaft and the second shaft are interconnected by at least one ak30 velocity synchronizing synchronizer. The pacemaker forces the shafts to rotate at the same speed, even if they are rotated by different motors. Preferably, said synchronizer comprises a first gear mounted on a first shaft, a second gear mounted on a second shaft, and a chain rotating about the first gear and the second gear.

20165779 prh 11-10-2019

In a third preferred embodiment of the lifting door according to the invention, the first shaft and the second shaft comprise intermediate shafts and connecting means for securing the intermediate shafts to one another. The connecting members may be end flanges arranged at the ends of the intermediate shafts, which may be fastened to each other by bolt fastening, or connecting sleeves into which the ends of the intermediate shafts may be fitted. The length of the intermediate shafts may be suitably selected so that an axis of substantially the width of the lifting door can be assembled from the intermediate shafts. By varying the lengths of the intermediate shafts and the number of motors and coils, the lifting mechanism can thus be adapted to the respective width and weight of the lifting doors.

A preferred embodiment of the lifting door according to the invention comprises a truss structure lower beam. The lattice bottom beam is structurally rigid but also lightweight.

In yet another preferred embodiment of the lifting door according to the invention, the en15 first coils and the second coils are mounted on coil bases which can be supported in building frame structures or door opening structures. Thus, the hoisting mechanism does not have its own integral frame, but the coils and motors belonging to the mechanism are supported as separate parts of the building frame structures and integrated into an integral whole by intermediate shafts.

In yet another preferred embodiment of the lifting door according to the invention, the door leaf comprises horizontal stiffeners which have a lattice structure. The lattice horizontal stiffeners are lightweight and well resistant to bending stress in the direction of the wind load on the lift door. Horizontal stiffeners in the lattice structure have a plurality of openings, which makes it easy to arrange the suspension members to pass through the vault stays from the first and second coils to the lower beam. Preferably, the lattice lower beam and the horizontal stiffeners are formed by bolted joints.

The advantage of the lift door according to the invention is that it prevents the lower beam of the door and the horizontal stiffeners from tilting during the lifting and lowering of the door, which reduces the wear of the slides and the noise of the door.

A further advantage of the invention is that it enables the number of coils to be increased, whereby the cross-sectional size of the lifting ropes or the lifting ropes on the coils and the size of the coils can be reduced. Smaller and lighter coils facilitate the assembly phase of the lifting mechanism.

20165779 prh 11-10-2019

The invention will now be described in detail. In the description, reference is made to the accompanying drawings, in which Fig. 1 is an exemplary front view of a lifting door according to the invention, Fig. 2 is an exemplary part of a lifting mechanism according to the invention.

Fig. 1 shows, by way of example, a front door according to the invention. The lifting door shown in Fig. 1 is a two-tiered fold-up fabric lifting door having a rectangular flexible door leaf 10. The door leaf 10 comprises two substantially parallel spaced topsheets, a first topsheet 12 and a second topsheet 14 and a plurality of first and second topsheets. Horizontal stiffeners are beam-like, preferably aluminum, parts spaced apart in a horizontal position. The surface fabrics are made of polyes15 reinforced PVC fabric or any other suitable durable fabric material. Preferably, the surface fabrics are fire, mold and UV resistant. At the bottom of the door leaf there is a housing-shaped lower beam 18 and at the top of the door leaf there is a door leaf lifting mechanism.

The lifting mechanism comprises two axes substantially the width of the door leaf, of which Figure 1 shows the first axis. The second shaft, which is not shown in Figure 1, is similar to the first shaft 20a. The first shaft is spaced from first spools 22a around which a lifting cable 24 is wound. The shafts are rotated by first electric motors 28a connected to the shafts by transmission. Coils and electric 25 motors are mounted on support beams 100 at the top of the door opening. Operation of the lifting mechanism is controlled by a control center 32 located adjacent to the lifting door on the wall of the space. The vertical edges of the lift door have side rails 26a, 26b that guide the ends of the lower beam and horizontal stiffeners to move parallel to the side rails. At the ends of the horizontal stiffeners, there are sliding blocks for reducing friction between the contact surfaces.

Fig. 2 shows, by way of example, a top view of a lifting mechanism of a lifting door according to the invention. The figure shows part of the first shaft 20a of the lifting mechanism and part of the second shaft 20b. Both shafts are identical in structure and parallel to each other. Akse

20165779 prh 11-10-2019 have intermediate shafts 40 having end flanges 42 at their ends. The lifting mechanism thus consists of modules which can be assembled for 5 lifting doors of different widths and weights by selecting the appropriate number of gearboxes 30a, 28b with motor 28a, 28b, coils 22a, 22b and intermediate shafts 40 connecting the coils and gearboxes. parallel axis. There can also be more than two parallel axes, for example three, four or 10 five. The number of shafts can be selected based on the weight and / or thickness of the door leaf.

The first shaft 20a of the part of the lifting mechanism shown in Figure 2 has two first reels 22a and a first motor 28a rotating a first shaft therebetween. Correspondingly, the second shaft 20b has two second coils 22b having a second motor 28b rotating the other shaft between them. The motors are electric motors and are connected to the shafts by means of transmissions 30. The motors and gearboxes are mounted on trays 46 supported on parallel support beams 100 at the top of the door opening. The first and second shafts are spaced apart and interconnected by a synchronizer 38, whereby a first gear 34a on a first shaft, a second gear 34b on a second shaft, and a chain 36 rotating about the first and second gears are worn. even if they are rotated by different engines. The pacemaker ensures that the lifting cable 24 is unwound from the coils and is wound on the coils 25 at the same speed so that the weight of the lifting door is evenly distributed between the lifting cables.

All coils on the shafts have the same structure. The coils are mounted on coil bases 44 mounted on parallel support beams 100 at the top of the door opening such that coils on the first axis 20a rest on the two closest support beams and coils on the second axis rest on the two furthest support beams. There is a gap between the support beams supporting the coils, through which the cable to be unloaded from the coil is led to the lower beam of the lifting door, not shown. The lifting mechanism is equipped with loose switches for monitoring the tension of the hoisting ropes, which stop the motors of the hoisting mechanism if the tension of any hoisting rope falls below the set threshold.

Some of the preferred embodiments of the lift door according to the invention have been described above. The invention is not limited to the solutions just described, but the inventive idea can be applied in numerous ways within the scope of the claims.

20165779 prh 11-10-2019

20165779 prh 14-08- 2017

Claims (12)

A lifting door having a door leaf (10), a lower beam (18) and a lifting mechanism for lifting and lowering the door leaf (10), comprising a first shaft (20a) having first rollers (22a) on the first rolls (22a). ) for wrapping suspension means, such as lifting ropes (24), attached to the first coils (22a) for wrapping suspension means on the first reels (22a) for rotating the first axis of at least one first motor (28a), characterized in that said lifting mechanism further comprises at least one second shaft (20b), the second shaft (20b) being adjacent to the first shaft (20a), at a distance from the first shaft (20a), and the second shaft (20b) having second coils (22b) for hanging members for coils (22b). , such as for lifting ropes (24), which suspension means (24) which are wound on the other coils (22b) are secured at its first end to the lower beam (18) at a distance from the suspension members of the first coil. Lifting door according to claim 1, characterized in that the lifting mechanism further comprises at least one second motor (28b) for rotating the second shaft (20b). Lifting door according to Claim 1 or 2, characterized in that said first shaft (20a) and the second shaft (20b) are connected to one another by a speed synchronizing synchronizer (38). A lifting door according to claim 3, characterized in that said synchronizer (38) comprises a first gear (34a) mounted on a first shaft, a second gear (34b) mounted on a second shaft, and a first gear (34a) and a second gear (34b) chain (36). Lifting door according to one of Claims 1 to 4, characterized in that said first shaft (20a) and the second shaft (20b) comprise intermediate shafts (40) and connecting means by which the intermediate shafts (40) are fixed to each other. Lifting door according to Claim 5, characterized in that said connecting means are end flanges (42) provided on the ends of the intermediate shafts (40). Lifting door according to one of Claims 1 to 6, characterized in that the lower beam (18) is of truss construction. Lifting door according to one of Claims 1 to 7, characterized in that the first coils (22a) and the second coils (22b) are mounted on coil bases (44) which can be supported on the building frame structures or door opening structures. , such as support beams (100). 5 Lifting door according to one of Claims 1 to 8, characterized in that said door leaf (10) comprises horizontal stiffeners (16), the horizontal stiffeners being of lattice construction. Lifting door according to Claim 9, characterized in that said suspension means (24) are arranged to pass through horizontal stiffeners (16). 10 from the other coils (22a, 22b) to the lower beam (18). Lifting door according to one of claims 9 or 10, characterized in that said lower beam (18) and horizontal stiffeners (16) are formed by bolted joints. Lifting door according to one of Claims 1 to 11, characterized in that it is a two-fabric fold-up fabric lifting door.