EP4389669A1 - Suspension means for a traction sheave elevator - Google Patents
Suspension means for a traction sheave elevator Download PDFInfo
- Publication number
- EP4389669A1 EP4389669A1 EP22216075.6A EP22216075A EP4389669A1 EP 4389669 A1 EP4389669 A1 EP 4389669A1 EP 22216075 A EP22216075 A EP 22216075A EP 4389669 A1 EP4389669 A1 EP 4389669A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strands
- traction means
- traction
- belt
- suspension means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 239000000725 suspension Substances 0.000 title claims abstract description 57
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 description 25
- 239000010959 steel Substances 0.000 description 25
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/06—Arrangements of ropes or cables
- B66B7/062—Belts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/0065—Roping
- B66B11/008—Roping with hoisting rope or cable operated by frictional engagement with a winding drum or sheave
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/04—Driving gear ; Details thereof, e.g. seals
- B66B11/043—Driving gear ; Details thereof, e.g. seals actuated by rotating motor; Details, e.g. ventilation
- B66B11/0476—Driving gear ; Details thereof, e.g. seals actuated by rotating motor; Details, e.g. ventilation with friction gear, e.g. belt linking motor to sheave
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/02—Guideways; Guides
- B66B7/022—Guideways; Guides with a special shape
Definitions
- the invention relates to a suspension means for a traction sheave elevator according to the generic term of claim 1 as well as the use of such a suspension means according to the generic term of claim 6 and a suspension means elevator with such a suspension means according to the generic term of claim 7.
- Lifting and lowering of the elevator car along the elevator shaft is typically accomplished by means of driven suspension means such as ropes or belts - especially when large differences in height have to be overcome.
- driven suspension means such as ropes or belts - especially when large differences in height have to be overcome.
- the suspension means is usually deflected several times with the aid of deflection pulleys in accordance with the principles of a pulley block. This allows the use of small, high-speed drive motors, which are much easier to integrate into the elevator shaft.
- Flat belts usually have a rectangular cross-section.
- one of the two long sides of the rectangular cross-section runs along the deflection pulleys and/or the traction sheave, so that the pulleys roll along this side of the suspension means.
- the two short sides of the cross-section which are perpendicular to the long sides, are typically much shorter than the diameter of steel cables used as suspension means instead of flat belts.
- flat belts are typically not, or at least not predominantly, made of steel, as is the case with cables used as suspension means. Instead, flat belts are usually made at least predominantly of polyurethane plastic. These two circumstances mean that flat belts are significantly more flexible than steel cords in the direction of rotation of the deflection pulleys or traction sheaves.
- Figs. 1 and 2 show such a deflection pulley 4 (or traction sheave 4) known from the prior art together with a flat belt 1 running on it.
- the belt running surface 5 is convexly curved.
- the flat belt 1 Due to the traction means strands 2 arranged in the belt base material 3, which are here designed as steel cords and are therefore relatively inelastic compared to the belt base material, the flat belt 1 exhibits a certain rigidity. This has the effect that the flat belt 1 does not rest on the convex belt running surface 5 over its entire width running in the direction orthogonal to the flanks 6 of the deflection pulley 4. This in turn has the consequence that the tensile forces exerted by the deflection pulleys 4 on the flat belt 1 do not result in a constant tension curve along the width of the flat belt 1.
- the steel cords 2 provided for absorbing the tensile forces in the flat belt 1 are therefore subjected to different loads.
- the steel cords 2 in the area of the center are subjected to maximum tensile stress, while the outer steel cords 2 are subjected to much lower stress.
- the entire flat belt 1 must be replaced. Accordingly, the problem described leads to a relatively short service life of the flat belt. It would be conceivable in principle to make the flat belts in the center area of the belt base material 3 thicker or of a different material than the steel cords 2 in the edge area. However, this would lead to a significant increase in the cost of manufacturing the flat belts.
- the solution to the above problem is provided by a suspension means elevator with a suspension means according to the invention, from which the car is suspended and raised or lowered.
- the suspension means elevator comprises a deflection pulley designed as a traction sheave, and preferably at least one further deflection pulley.
- the elevator is characterized in that at least one deflection pulley contacts the suspension means with its convex jacket.
- the jacket of the deflection pulley has a curvature which is designed in such a way that traction means strands enclosed near the flank in the flat belt tend to be less heavily loaded than traction means strands enclosed centrally or near the center.
- the car is "suspended" from the suspension means can mean both that the suspension means is rigidly connected to the car at one end, i.e. the car is literally suspended from the suspension means.
- at least one deflection pulley is attached to the elevator car, which rolls along a loop formed by the suspension means.
- the car is attached to the suspension means in such a way that driving the suspension means by means of a traction sheave raises or lowers the car.
- a suspension means does not mean a single suspension means, but preferably four suspension means in the form of flat belts arranged parallel to each other and either flank to flank or at least close to each other.
- the word “a” is therefore not used as a number word, but as an indefinite article.
- the three central traction means strands form two traction means strand pairs. These two pairs of traction means strands are spaced less apart than all other pairs of traction means strands.
- one of the traction means strands is arranged exactly in the center of the flat belt and the other two traction means strands are arranged symmetrically to the left and right of the first traction means strand.
- the traction means strands are at least partially ropes and preferably metal ropes. More preferably, the traction means strands are predominantly ropes and preferably metal ropes. Ideally, the traction means strands are even completely ropes and preferably metal ropes.
- the individual steel wire strands are each braided together to form a steel rope. It is also conceivable that different types of wires are used in one rope, thus combining the advantages of different materials. In this way, the required tensile strength of the traction means strands can be ensured while at the same time achieving sufficient flexibility.
- the at least one deflection pulley and the suspension means assigned to it are matched to each other in such a way that the stress difference that occurs when the suspension means circulates over the at least one deflection pulley between the central traction means strand or strands and each of the two traction means strands closest to the flank is less than 35%. It is better if the tension difference is less than 25%.
- the design of the suspension means or the traction means strands must be based on the traction means strands subjected to the highest loads. If the traction means strands in the center area (at B/2) of the flat belt are no longer loaded many times more than the traction means strands in the edge area, the less heavily loaded traction means strands no longer have to be so heavily oversized. This has a positive effect on the manufacturing costs of the suspension means.
- the at least one deflection pulley has a belt running surface on its jacket that is wider than the width of the suspension means.
- Fig. 3 shows a cross-section of a flat belt 1, which clearly illustrates its structure.
- the flat belt 1 consists of a belt base material 3 and six traction means strands 2 arranged inside the belt base material 3.
- the traction means strands 2 are steel cords with a round cross-section.
- the belt base material 3 is polyurethane with a rectangular cross-section. While the traction means strands 2 serve to absorb the tensile stresses occurring during operation of the flat belt 1, the belt base material 3 serves to ensure sufficient static friction between the deflection pulleys 4 and the flat belt 1, or the drive pulley and the flat belt 1.
- the diameter of the individual traction means strands 2 is approximately 60% of the thickness D of the belt base material 3, which corresponds to the short side of the rectangular cross-section of the belt base material 3.
- the traction means strands 2 are not arranged uniformly over the width B of the flat belt 1 corresponding to the long side of the belt base material 3. It is true that the traction means strands 2 are arranged mirror-symmetrically in relation to an imaginary plane running through half the width B of the belt base material 3. However, the distances between the individual traction means strands 2 increase starting from the traction means strands 2 arranged in the center of the belt base material 3 to the traction means strands 2 arranged at the edge of the belt base material 3. The distance between the two central traction means strands 2 is less than their respective radius.
- the longitudinal axes of the individual traction means strands 2 all lie on an imaginary line running through half the thickness D of the belt base material 3 and orthogonal to the short sides of the belt base material 3.
- a relatively uniform stress distribution is achieved on the individual traction means strands 2.
- This is illustrated by Fig. 4 .
- the flat belt 1 can be seen together with a deflection pulley 4.
- the flat belt 1 is in contact with the belt running surface 5 of the deflection pulley 4 in such a way that a movement of the flat belt 1 in the circumferential direction of the deflection pulley 4 leads to a rotational movement of the deflection pulley 4.
- the flat belt 1 is centered on the deflection pulley 4.
- the belt running surface 5 is convexly curved.
- the flat belt 1 can then be mounted on the deflection pulley 4 in such a way that the apex of the convex curvature of the belt running surface 5 lies exactly below the center of the flat belt 1. Then the symmetrical structure of the flat belt 1 in combination with the tensile forces acting on the flat belt 1 during operation ensures the required centering. Due to the relatively large distance between the traction means strands 2 in the edge area of the flat belt 1, it is ensured on the one hand that the flat belt 1 is less stiff and lies better against the convex curved belt running surface 5.
- the small distance between the traction means strands 2 in the central area of the flat belt 1 ensures that the maximum tensile stresses occurring in this area are distributed over as many traction means strands 2 as possible. Since there are fewer traction means strands 2 in the edge area of the flat belt 1, but the tensile stresses are also lower, the individual traction means strands 2 of the flat belt 1 are subjected to a much more uniform load overall.
- the tensile stresses acting on the individual traction means strands 2 are illustrated schematically by the arrows in Fig. 4 .
- the structure of an individual traction means strand 2 can be understood from Fig. 5 . This shows that the individual traction means strands 2 are not made of solid material but are formed by a large number of thin steel wires 7 which are interwoven with one another.
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- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
Abstract
Suspension means having a width B and a thickness D for a traction sheave elevator in the form of a flat belt with a plurality of traction means strands which are embedded in a friction-increasing belt base material via which they contact the traction sheave and optionally at least one further deflection pulley during regular operation, characterized in that directly adjacent traction means strands are spaced apart from one another by a smaller distance in the region of the belt center (at B/2) than in the regions of the flat belt near the flanks.
Description
- The invention relates to a suspension means for a traction sheave elevator according to the generic term of
claim 1 as well as the use of such a suspension means according to the generic term ofclaim 6 and a suspension means elevator with such a suspension means according to the generic term of claim 7. - Lifting and lowering of the elevator car along the elevator shaft is typically accomplished by means of driven suspension means such as ropes or belts - especially when large differences in height have to be overcome. In order to reduce the drive torque required to operate a corresponding suspension means elevator, the suspension means is usually deflected several times with the aid of deflection pulleys in accordance with the principles of a pulley block. This allows the use of small, high-speed drive motors, which are much easier to integrate into the elevator shaft.
- To further reduce the installation space required in the elevator shaft, flat belts are also increasingly being used as suspension means instead of steel ropes. This is because the use of flat belts generally allows the diameter of the traction sheave(s) and deflection pulley(s) to be further reduced due to the geometry of flat belts as well as their material.
- Flat belts usually have a rectangular cross-section. When the elevator is in operation, one of the two long sides of the rectangular cross-section runs along the deflection pulleys and/or the traction sheave, so that the pulleys roll along this side of the suspension means. The two short sides of the cross-section, which are perpendicular to the long sides, are typically much shorter than the diameter of steel cables used as suspension means instead of flat belts. Also, flat belts are typically not, or at least not predominantly, made of steel, as is the case with cables used as suspension means. Instead, flat belts are usually made at least predominantly of polyurethane plastic. These two circumstances mean that flat belts are significantly more flexible than steel cords in the direction of rotation of the deflection pulleys or traction sheaves. When the suspension means is deflected by 180° - as is typically the case along the outer circumferential surface of the traction sheave - the radius that can be realized with flat belts is significantly smaller than is the case with steel cords. As a result, significantly smaller deflection pulleys and traction sheaves can be used. In terms of the available installation space, these can in turn be integrated into the elevator shaft much more easily.
- It is true that there are usually several steel cords inside the flat belts, as the flat belts made of plastic would otherwise not be able to withstand the tensile forces occurring during operation of the elevator. However, these steel cords have a diameter many times smaller than the steel cords used instead of flat belts as suspension means. Accordingly, the steel cords installed inside flat belts can complete a radius many times smaller than the steel cords used instead of shed belts for the same deflection angle.
- In order to ensure that the flat belt cannot slip off the traction sheave or the deflection pulleys during unwinding or collide with any lateral limiting element and cause excessive wear, the flat belt must be centered on the traction sheave and the deflection pulleys. Traction sheaves and deflection pulleys with a convex curved rotating surface are typically used for this purpose.
Figs. 1 and2 show such a deflection pulley 4 (or traction sheave 4) known from the prior art together with aflat belt 1 running on it. Here it can be seen that thebelt running surface 5 is convexly curved. Theflat belt 1 lies on thebelt running surface 5 in such a way that - if it were completely rigid - it would form the tangent to the apex of thebelt running surface 5. Due to its elasticity, however, theflat belt 1 adapts at least to a certain extent to the course of thebelt running surface 5. Since theflat belt 1 is tensioned between a number of deflection pulleys 4 (and at least one traction sheave 4) during operation, tensile forces act on the flat belt at thedeflection pulleys 4. These tensile forces then ensure that theflat belt 1 does not move in the direction of one of theflanks 6 bounding thebelt running surface 5, but remains centered in the area of the apex of the convexbelt running surface 5. - As has been shown from an FEM analysis, however, there are also disadvantages associated with this type of centering. Due to the traction means
strands 2 arranged in thebelt base material 3, which are here designed as steel cords and are therefore relatively inelastic compared to the belt base material, theflat belt 1 exhibits a certain rigidity. This has the effect that theflat belt 1 does not rest on the convexbelt running surface 5 over its entire width running in the direction orthogonal to theflanks 6 of thedeflection pulley 4. This in turn has the consequence that the tensile forces exerted by thedeflection pulleys 4 on theflat belt 1 do not result in a constant tension curve along the width of theflat belt 1. Rather, there is a maximum tensile stress in the center of theflat belt 1, which is centrally located above the apex of the convex belt running surface, which decreases towards the edges of theflat belt 1. This is illustrated schematically by the arrows inFig. 2 . - The
steel cords 2 provided for absorbing the tensile forces in theflat belt 1 are therefore subjected to different loads. Thesteel cords 2 in the area of the center are subjected to maximum tensile stress, while theouter steel cords 2 are subjected to much lower stress. This is problematic in that thesteel cords 2 exposed to the maximum tensile stress (with the same dimensions) have a significantly shorter service life than theouter steel cords 2. As soon as one of thesteel cords 2 has exceeded its service life, the entireflat belt 1 must be replaced. Accordingly, the problem described leads to a relatively short service life of the flat belt. It would be conceivable in principle to make the flat belts in the center area of thebelt base material 3 thicker or of a different material than thesteel cords 2 in the edge area. However, this would lead to a significant increase in the cost of manufacturing the flat belts. - In view of this, it is the task of the invention to provide suspension means in the form of a flat belt with increased service life.
- The solution to the above problem is provided by a suspension means elevator with a suspension means according to the invention, from which the car is suspended and raised or lowered. The suspension means elevator comprises a deflection pulley designed as a traction sheave, and preferably at least one further deflection pulley. The elevator is characterized in that at least one deflection pulley contacts the suspension means with its convex jacket. The jacket of the deflection pulley has a curvature which is designed in such a way that traction means strands enclosed near the flank in the flat belt tend to be less heavily loaded than traction means strands enclosed centrally or near the center.
- Due to the convex jacket surface or the convex belt running surface of the deflection pulley, the traction means is centered on the belt running surface during operation - as already described above. Since the traction means strands in the flat belt have a smaller distance from each other in the area of the belt center (at B/2) than in the areas of the flat belt near the flanks, the tensile stress occurring in the flat belt is better distributed over the individual traction means strands. This increases the service life of the suspension means and reduces the amount of maintenance required to operate the elevator.
- The fact that the car is "suspended" from the suspension means can mean both that the suspension means is rigidly connected to the car at one end, i.e. the car is literally suspended from the suspension means. However, it also includes that at least one deflection pulley is attached to the elevator car, which rolls along a loop formed by the suspension means. In any case, the car is attached to the suspension means in such a way that driving the suspension means by means of a traction sheave raises or lowers the car.
- In this context, "a" suspension means does not mean a single suspension means, but preferably four suspension means in the form of flat belts arranged parallel to each other and either flank to flank or at least close to each other. The word "a" is therefore not used as a number word, but as an indefinite article.
- There are a number of ways in which the invention can be designed to further improve its effectiveness or usefulness.
- For example, it is particularly preferable for the two central traction means strands to be spaced less apart than all other pairs of traction means strands.
- In the area of the belt center - i.e. at B/2 - maximum tensile stresses occur due to the type of centering of the traction means by means of a convex belt running surface already described. Since the distance between the traction means strands is smallest here, the highest traction means strand density is achieved in this area. The tensile forces occurring in the traction means strands are thus reduced.
- Due to the centering of the suspension means, it is advantageous if the traction means strands are always arranged in pairs. This results in a symmetrical distribution of tensile forces over the traction means strands arranged along the width B of the flat belt.
- In a further preferred embodiment, the three central traction means strands form two traction means strand pairs. These two pairs of traction means strands are spaced less apart than all other pairs of traction means strands.
- Ideally, one of the traction means strands is arranged exactly in the center of the flat belt and the other two traction means strands are arranged symmetrically to the left and right of the first traction means strand.
- This ensures that the maximum possible traction means strand density is achieved in the center of the flat belt, i.e. in the area of maximum tensile stress.
- And also in the area adjacent to the center of the flat belt, which is also subjected to high tensile stresses, a good distribution of the tensile stress across the traction means strands is achieved by the two pairs of traction means strands, which are spaced a short distance apart compared to the other pairs of traction means strands.
- In a further preferred embodiment, the two traction means strands adjoining the center traction means strands on the left and right in the direction along the longitudinal axis L of the flat belt each form a traction means strand pair with a traction means strand of the central traction means strands. The traction means strands each forming such a pair of traction means strands are spaced further apart than the central traction means strands. In addition, the traction means strands forming such a pair of traction means strands are spaced apart by a smaller distance than the traction means strands adjoining them laterally on the left and right.
- As a result, the density of the traction means strands is increasingly increased from the edge regions of the flat belt toward the longitudinal axis L of the flat belt. Most of the central traction means strands are therefore provided in the area of maximum tensile stress. The difference in the tensile forces occurring in the traction means strands is thus reduced.
- It is conceivable that the central traction means strands are three traction means strands, one of which is arranged exactly at B/2 and the other two symmetrically to the left and right of this. However, it is equally conceivable that the "central" traction means strands are only two traction means strands arranged to the left and right of the flat belt`s longitudinal axis.
- The "flat belt's longitudinal axis" is the axis of the flat belt extending through the B/2 and D/2 and parallel to the longitudinal axis of the individual traction means strands.
- In another preferred embodiment, the traction means strands are at least partially ropes and preferably metal ropes. More preferably, the traction means strands are predominantly ropes and preferably metal ropes. Ideally, the traction means strands are even completely ropes and preferably metal ropes.
- In the case of the use of metal ropes as traction means strands, the ropes are preferably steel ropes, each of which is formed from a plurality of individual steel wire strands.
- For this purpose, the individual steel wire strands are each braided together to form a steel rope. It is also conceivable that different types of wires are used in one rope, thus combining the advantages of different materials. In this way, the required tensile strength of the traction means strands can be ensured while at the same time achieving sufficient flexibility.
- Preferably, the at least one deflection pulley and the suspension means assigned to it are matched to each other in such a way that the stress difference that occurs when the suspension means circulates over the at least one deflection pulley between the central traction means strand or strands and each of the two traction means strands closest to the flank is less than 35%. It is better if the tension difference is less than 25%.
- The design of the suspension means or the traction means strands must be based on the traction means strands subjected to the highest loads. If the traction means strands in the center area (at B/2) of the flat belt are no longer loaded many times more than the traction means strands in the edge area, the less heavily loaded traction means strands no longer have to be so heavily oversized. This has a positive effect on the manufacturing costs of the suspension means.
- Ideally, the at least one deflection pulley has a belt running surface on its jacket that is wider than the width of the suspension means.
- This allows a sufficient safety distance to be maintained from the edge area of the deflection pulley. This reduces the risk of the suspension means slipping off the deflection pulley or colliding with any sections of the deflection pulley that limit the belt running surface of the deflection pulley.
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Figs. 1 - 2 show a known prior art suspension device in an operationally mounted state together with a deflection pulley. -
Fig. 3 shows a suspension means according to the invention in cross-section. -
Fig. 4 shows a suspension means according to the invention in the operationally mounted state together with a deflection pulley. -
Fig. 5 shows the structure of a traction means strand. - The operation of the invention is explained by way of example with reference to
Figures 3-5 . -
Fig. 3 shows a cross-section of aflat belt 1, which clearly illustrates its structure. Theflat belt 1 consists of abelt base material 3 and six traction meansstrands 2 arranged inside thebelt base material 3. The traction meansstrands 2 are steel cords with a round cross-section. Thebelt base material 3 is polyurethane with a rectangular cross-section. While the traction meansstrands 2 serve to absorb the tensile stresses occurring during operation of theflat belt 1, thebelt base material 3 serves to ensure sufficient static friction between the deflection pulleys 4 and theflat belt 1, or the drive pulley and theflat belt 1. The diameter of the individual traction meansstrands 2 is approximately 60% of the thickness D of thebelt base material 3, which corresponds to the short side of the rectangular cross-section of thebelt base material 3. - The traction means
strands 2 are not arranged uniformly over the width B of theflat belt 1 corresponding to the long side of thebelt base material 3. It is true that the traction meansstrands 2 are arranged mirror-symmetrically in relation to an imaginary plane running through half the width B of thebelt base material 3. However, the distances between the individual traction meansstrands 2 increase starting from the traction meansstrands 2 arranged in the center of thebelt base material 3 to the traction meansstrands 2 arranged at the edge of thebelt base material 3. The distance between the two central traction meansstrands 2 is less than their respective radius. There is already a distance to each of the traction meansstrands 2 adjacent to the two central traction meansstrands 2, which corresponds approximately to the diameter of the individual traction meansstrands 2. By contrast, there is a distance between the traction meansstrands 2 adjacent to the central traction meansstrands 2 and the respective (near-flank) traction meansstrands 2 adjacent thereto which corresponds approximately to twice the diameter of the individual traction meansstrands 2. Between the last-mentioned near-flank traction meansstrands 2 and the lateral edge of thebelt base material 3 there is in each case a distance of approximately half the diameter of an individual traction meansstrand 2. - The longitudinal axes of the individual traction means
strands 2 all lie on an imaginary line running through half the thickness D of thebelt base material 3 and orthogonal to the short sides of thebelt base material 3. - Due to the described arrangement of the traction means
strands 2, a relatively uniform stress distribution is achieved on the individual traction meansstrands 2. This is illustrated byFig. 4 . There, theflat belt 1 can be seen together with adeflection pulley 4. Theflat belt 1 is in contact with thebelt running surface 5 of thedeflection pulley 4 in such a way that a movement of theflat belt 1 in the circumferential direction of thedeflection pulley 4 leads to a rotational movement of thedeflection pulley 4. To ensure that theflat belt 1 does not shift in the direction of theflanks 6 of thedeflection pulley 4 during operation, theflat belt 1 is centered on thedeflection pulley 4. For this purpose, thebelt running surface 5 is convexly curved. Theflat belt 1 can then be mounted on thedeflection pulley 4 in such a way that the apex of the convex curvature of thebelt running surface 5 lies exactly below the center of theflat belt 1. Then the symmetrical structure of theflat belt 1 in combination with the tensile forces acting on theflat belt 1 during operation ensures the required centering. Due to the relatively large distance between the traction meansstrands 2 in the edge area of theflat belt 1, it is ensured on the one hand that theflat belt 1 is less stiff and lies better against the convex curvedbelt running surface 5. In addition, the small distance between the traction meansstrands 2 in the central area of theflat belt 1 ensures that the maximum tensile stresses occurring in this area are distributed over as many traction meansstrands 2 as possible. Since there are fewer traction meansstrands 2 in the edge area of theflat belt 1, but the tensile stresses are also lower, the individual traction meansstrands 2 of theflat belt 1 are subjected to a much more uniform load overall. The tensile stresses acting on the individual traction meansstrands 2 are illustrated schematically by the arrows inFig. 4 . - The structure of an individual traction means
strand 2 can be understood fromFig. 5 . This shows that the individual traction meansstrands 2 are not made of solid material but are formed by a large number of thin steel wires 7 which are interwoven with one another. -
- 1
- Suspension means/ flat belt
- 2
- Traction means strand or steel cord
- 3
- Belt base material
- 4
- Traction sheave or deflection pulley
- 5
- Belt contact area/belt running surface
- 6
- Flanks of the deflection pulley or traction sheave
- 7
- Single wires
- B
- Width of the suspension means or belt
- D
- Thickness of the suspension means or belt
Claims (9)
- Suspension means (1) having a width B and a thickness D for a traction sheave elevator in the form of a flat belt (1) with a plurality of traction means strands (2) which are embedded in a friction-increasing belt base material (3) via which they contact the traction sheave (4) and optionally at least one further deflection pulley (4) during regular operation, characterized in that directly adjacent traction means strands (2) are spaced apart from one another by a smaller distance in the region of the belt center (at B/2) than in the regions of the flat belt (1) near the flanks.
- Suspension means (1) for a traction sheave elevator according to claim 1, characterized in that the two central traction means strands (2) have a smaller distance from each other than all other pairs of traction means strands (2) .
- Suspension means (1) for a traction sheave elevator according to claim 1, characterized in that the three central traction means strands (2) form two pairs of traction means strands (2), each of which has a smaller distance from each other than all other pairs of traction means strands (2).
- Suspension means (1) for a traction sheave elevator according to claim 2 or 3, characterized in that the two traction means strands (2) adjoining the central traction means strands (2) on the left and right in the direction along the longitudinal flat belt axis L each form a pair of traction means strands with a traction means strand (2) of the central traction means strands (2), wherein the traction means strands (2) of said pair of traction means strands have a greater distance from one another than the central traction means strands (2) and the traction means strand (2) of which are at a smaller distance from one another than the laterally adjoining traction means strands (2) on the left and right.
- Suspension means (1) according to one of the preceding claims, characterized in that the traction means strands (2) are ropes, preferably metal ropes.
- Use of a suspension means (1) according to one of the preceding claims in such a way that it is deflected in another direction, preferably by at least 170°, via at least one deflection pulley (4) with a convexly curved belt contact area (5).
- Suspension means elevator with a suspension means (1) according to one of the preceding claims with a deflection pulley (4) designed as a traction sheave (4) and preferably at least one further deflection pulley (4), characterized in that at least one deflection pulley (4) contacts the suspension means (1) with its convex jacket, the curvature of which is such that traction means strands (2) enclosed near the flank in the flat belt (1) tend to be less heavily loaded than traction means strands (2) enclosed centrally or near the center.
- Suspension means elevator according to the immediately preceding claim, characterized in that the at least one deflection pulley (4) and the suspension means (1) associated therewith are matched to one another in such a way that the tension difference which arises during the circulation of the suspension means (1) over the at least one deflection pulley (4) between the central traction means strand or strands (2) and each of the two traction means strands (2) lying closest to the flank is less than 35% and preferably less than 25%.
- Suspension means elevator according to the two immediately preceding claims, characterized in that the at least one deflection pulley (4) has on its jacket a belt running surface (5) which is wider than the suspension means width (B).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22216075.6A EP4389669A1 (en) | 2022-12-22 | 2022-12-22 | Suspension means for a traction sheave elevator |
CN202311787525.XA CN117509353A (en) | 2022-12-22 | 2023-12-22 | Suspension device for traction sheave elevator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22216075.6A EP4389669A1 (en) | 2022-12-22 | 2022-12-22 | Suspension means for a traction sheave elevator |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4389669A1 true EP4389669A1 (en) | 2024-06-26 |
Family
ID=84568805
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP22216075.6A Pending EP4389669A1 (en) | 2022-12-22 | 2022-12-22 | Suspension means for a traction sheave elevator |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP4389669A1 (en) |
CN (1) | CN117509353A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03176912A (en) * | 1989-12-05 | 1991-07-31 | Hitachi Cable Ltd | Flat elevator cable |
WO2006057641A2 (en) * | 2004-11-24 | 2006-06-01 | Otis Elevator Company | Joint configuration for a load bearing assembly |
WO2022044213A1 (en) * | 2020-08-27 | 2022-03-03 | 三菱電機株式会社 | Belt, method for producing same, and elevator |
-
2022
- 2022-12-22 EP EP22216075.6A patent/EP4389669A1/en active Pending
-
2023
- 2023-12-22 CN CN202311787525.XA patent/CN117509353A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03176912A (en) * | 1989-12-05 | 1991-07-31 | Hitachi Cable Ltd | Flat elevator cable |
WO2006057641A2 (en) * | 2004-11-24 | 2006-06-01 | Otis Elevator Company | Joint configuration for a load bearing assembly |
WO2022044213A1 (en) * | 2020-08-27 | 2022-03-03 | 三菱電機株式会社 | Belt, method for producing same, and elevator |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Week 199137, Derwent World Patents Index; AN 1991-269935 * |
DATABASE WPI Week 2022002, Derwent World Patents Index; AN 2022-39679T * |
Also Published As
Publication number | Publication date |
---|---|
CN117509353A (en) | 2024-02-06 |
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