EP2928806B1 - Cable clamp, and lift system having a cable clamp - Google Patents

Description

The invention relates to a rope clamp for a rope of an elevator installation, in particular for a suspension rope of an elevator installation installed in a shaft of a building under construction, with a support device which has a wedge seat with a first support surface and a second support surface arranged at an angle to the first support surface. and with a wedge-shaped clamping device which can be moved back and forth in the wedge seat between a clamping position and a release position and which has a first clamping surface opposite the first supporting surface and a second clamping surface opposite the second supporting surface, the two clamping surfaces being aligned obliquely to one another.

In addition, the invention relates to an elevator system with such a cable clamp.

Elevator systems usually have a drive device which is coupled via a support cable to a car which can be moved up and down in a vertical shaft. The car is often also connected to a counterweight via the suspension cable. In tall buildings, elevator systems of this type are required already during the construction of the building in order to transport construction workers and construction material as close as possible to the floor on which the construction work is currently taking place. For this purpose, elevator systems are known which are initially installed in a lower shaft area so that the lower shaft area can be served by the elevator system and which are gradually moved upwards in the shaft as construction progresses, so that the shaft area increases, that of the elevator system can be operated. Moving the elevator system to a higher shaft area makes it necessary to close the suspension cable or other cables, for example a speed limiter cable extend. For this purpose it can be provided that the ropes initially used are replaced by longer ropes. Alternatively, a rope clamp and a rope supply can be used, for example a rope pulley, so that after the rope clamp is deactivated, the effective length of the rope can be increased by removing an extension section from the rope supply and passing it through the rope clamp. After reaching the desired rope length, the rope clamp is reactivated so that the rope with the increased length is clamped.

So that after loosening the rope clamp, the rope section that has been clamped in after taking it out of the rope clamp can take on a supporting function, it is necessary that the rope clamp not impair the mechanical strength of the rope, on the other hand, the rope should be able to be reliably clamped in place.

In the EP 2 371 753 A1 describes a cable clamp in which two pairs of clamping jaws are arranged offset in the vertical direction in a housing-like support device and the cable to be clamped is passed through the first pair of clamping jaws and through the second pair of clamping jaws. The pairs of clamping jaws are each subjected to a preload force by an upstream spring. The clamping jaws each slide with a clamping surface along an assigned support surface of the support device and are pressed against the rope. The tensile stress of the rope then leads to the fact that the clamping jaws assume their clamping position in which they clamp the rope between them. The cable can be clamped and released again several times by means of such a cable clamp, but the cable clamp is of considerable size. In the US 5 197 571 A two separate rope clips with wedges are described, between which a deflection roller is arranged.

The object of the present invention is to develop a cable clamp of the type mentioned at the outset in such a way that it enables repeated clamping and releasing of the cable with a compact design, without the mechanical load capacity of the cable being impaired thereby.

This object is achieved according to the invention in the case of a cable clamp of the generic type in that the cable clamp comprises a deflection device and a first clamping region arranged between the first clamping surface and the first support surface and a second clamping region arranged between the second clamping surface and the second support surface, the clamping region to be clamped Rope can be passed through the two clamping areas and can be deflected from the first clamping area to the second clamping area by means of the deflection device.

According to the invention, the cable clamp has a wedge-shaped clamping device that defines a first clamping surface and a second clamping surface. A support surface of the support device is located opposite each of the clamping surfaces, and the cable is guided between the clamping and support surfaces. The wedge-shaped clamping device can be moved back and forth between a clamping position and a release position. If the clamping device assumes its clamping position, the rope is clamped in the first clamping area and in the second clamping area. If the clamping is to be released, it is only necessary to move the clamping device into its release position, because this releases the rope both in the first clamping area and in the second clamping area.

The deflection device enables the rope to be clamped to be looped around the clamping device, so that it can be clamped simultaneously to two clamping areas arranged offset to one another in the longitudinal direction of the rope as soon as the clamping device assumes its clamping position, the clamping areas not needing to be arranged along a straight line Rather, the clamping areas can be positioned next to each other due to the deflection device. The cable clamp can thus have a very compact design and requires only a relatively small amount of space. The cable clamp can therefore also be installed in a machine room of an elevator system, even in tight spaces.

In the position of use of the cable clamp, the first support surface and the first clamping surface can be aligned vertically and the second support surface and the second clamping surface can be oriented obliquely to the vertical. The distance between the two support surfaces, like the distance between the two clamping surfaces, can expand in the vertical direction. The rope to be clamped can plunge vertically from below into the first clamping area, pass through it vertically upwards, then be deflected by the deflection device to the second clamping area and then pass through it diagonally to the vertical from top to bottom in order to at the lower end of the step out of this second clamping area. If the rope experiences a tension in the direction of the end of the second clamping area facing away from the deflection device, the clamping device automatically goes into its clamping position in which the rope is clamped in the two clamping areas.

In the cable clamp according to the invention, the cable is clamped, that is to say the clamping device is self-clamping, in that, due to the frictional force acting between the cable and the clamping device, it automatically changes into its clamping position as soon as the cable is subjected to tensile stress. It is therefore not absolutely necessary to apply a pretension to the clamping device so that it moves into its clamping position by the cable pull. For example, the weight of the clamping device can ensure a sufficiently large frictional force between the clamping device and the rope, so that the clamping device automatically changes into its clamping position by the cable pull.

A particularly compact embodiment of the cable clamp is achieved in an advantageous embodiment of the invention in that the two clamping regions are arranged at the same height in relation to the vertical in the use position of the cable clamp. The vertical extension of the rope clamp can be kept particularly low.

In a particularly simple construction, the clamping device has a clamping wedge. With the help of the wedge, the rope can be easily Be clamped both in the first clamping area and in the second clamping area.

The deflection device is advantageously held on the clamping device. This makes it possible to move the deflection device together with the clamping device, so that the spacing relationships between the clamping device and the deflection device do not change when the clamping device moves back and forth between its release position and its clamping position.

It is expedient if the deflection device has a rotatably mounted deflection roller.

It is advantageous if the diameter of the deflection roller is at least as large as the maximum distance between the ends of the two clamping areas facing the deflection roller. The rope to be clamped is guided around the deflection roller between the first clamping area and the second clamping area. The radius of the pulley corresponds to the bending radius of the rope. The two clamping areas are aligned at an angle to one another, so that their distance in the direction of the deflection roller increases. The fact that the diameter of the deflection roller is at least as large as the maximum distance between the two clamping areas ensures that the rope to be clamped is only subjected to a relatively low bending load in the region of the deflection roller.

In an advantageous embodiment of the invention, the two support surfaces and the two clamping surfaces each have a groove-shaped depression which can be applied to the rope surface. In the first clamping area and in the second clamping area, the rope can be clamped between a recess of a clamping surface and a recess of a support surface. The depressions hold the rope between them. As a result, the risk of mechanical impairment of the rope when clamping is kept particularly low.

The depressions can, for example, be V-shaped or circular-arc-shaped.

It is particularly advantageous if the depressions can be positively applied to the rope surface. In such a configuration, the recesses receive the rope to be clamped between them with a precise fit.

In an advantageous embodiment, the rope clamp according to the invention has a manually, electrically, pneumatically or hydraulically actuated release device for releasing a rope clamp. By means of the release device, the clamping device can be transferred from its clamping position to its release position.

The release device preferably comprises a piston-cylinder unit which can be acted upon with pressure medium, in particular with hydraulic fluid.

It is particularly favorable if the release device is arranged below the clamping device in the use position of the cable clamp. The release device can thereby raise the clamping device against its weight to release the clamping.

The support device preferably has two support arms which are rigidly connected to one another via two connecting links and each define a support surface. The support device thus forms a housing which surrounds the clamping device in the circumferential direction. It is advantageous here if the clamping device has a clamping wedge which is arranged between the two support arms and the two connecting members and which has two clamping surfaces, each of which faces a supporting surface.

As mentioned at the beginning, the invention relates not only to a cable clamp of the type explained above but also to an elevator installation with such a cable clamp. The elevator installation comprises a drive device that is coupled via a suspension cable to a car which can be moved up and down in a vertical shaft. In addition, the elevator installation according to the invention has a cable drum, on which an end section of the support cable is wound, and a cable clamp of the type mentioned above, into which a section of the support cable is releasably clamped. The elevator system can, for example, be installed in the shaft of a building under construction. As the construction progresses, the elevator system can be gradually moved upwards in the shaft. The necessary extension of the suspension cable is achieved in a structurally simple manner in that a corresponding extension section of the suspension cable is unwound from the cable drum after the cable clamp has been released beforehand. When the elevator system is moved vertically upwards in the shaft, the suspension cable can then run through the rope clamp from the rope drum, and after the desired height of the elevator installation has been reached, the suspension cable can be clamped again by means of the rope clamp. This process can be repeated several times.

In an advantageous embodiment of the elevator installation according to the invention, the cable drum is arranged in a storage area inside or outside the shaft, for example in a shaft base of the shaft. The weight of the rope drum can be carried directly from the bottom of the shaft. Alternatively, it can be provided that the storage area is arranged outside the shaft, for example in an adjoining room.

It is advantageous if both the drive device and the cable clamp are arranged in a machine room of the elevator system that is temporarily fixed in the shaft. To operate the elevator system in a building under construction, the machine room can be temporarily fixed in the shaft. After completion of construction, the machine room can be gradually raised vertically. The drive system of the elevator system and the cable clamp are arranged in the machine room. The cable clamp only requires a relatively small installation space and can therefore be positioned in the machine room even when space is limited.

In an advantageous embodiment of the elevator installation according to the invention, the supporting rope is guided from the elevator car to the rope clamp via at least one deflection element. The at least one deflection element makes it possible to arrange the cable section coming from the car offset in the horizontal direction from the cable section leading from the cable clamp to the cable drum. The cable clamp can be positioned above the cable drum, a first clamping area of the cable clamp being aligned with the cable section connecting the cable clamp to the cable drum. The first clamping area is thus oriented vertically in the position of use of the cable clamp. Starting from the first clamping area, the cable is guided by means of the deflection device to the second clamping area, which is inclined to the vertical and approaches the first clamping area from top to bottom. From the second clamping area, the rope can be guided via at least one deflection element to a deflection roller arranged on the roof of the car or the counterweight, from which the rope then reaches the drive device.

Figur 1:

eine schematische Darstellung einer vorteilhaften Ausführungsform einer erfindungsgemäßen Aufzuganlage, die im Schacht eines im Bau befindlichen Gebäudes installiert ist;

Figur 2:

eine schematische Darstellung einer vorteilhaften Ausführungsform einer Seilklemme der Aufzuganlage aus Figur 1, und

Figur 3:

eine Schnittansicht längs der Linie 3-3 von Figur 2.

The following description of an advantageous embodiment of the invention serves in conjunction with the drawing for a more detailed explanation. Show it:

Figure 1:

a schematic representation of an advantageous embodiment of an elevator system according to the invention, which is installed in the shaft of a building under construction;

Figure 2:

a schematic representation of an advantageous embodiment of a cable clamp of the elevator system Figure 1 , and

Figure 3:

a sectional view taken along line 3-3 of Figure 2 .

In Figure 1 schematically shows an elevator system 10 according to the invention, which is installed in a vertical shaft 12 of a building under construction. The elevator installation 10 comprises a machine room 14 which is temporarily fixed in the shaft 12 with the aid of fastening members 15, 16. A drive device 18 of the elevator installation 10 is positioned in the machine room 14. The drive device 18 has a traction sheave 19 which can be driven in the usual way by a motor.

The drive device 18 is coupled to a car 23 and to a counterweight 25 via a support cable 21. In the machine room 14 there is also an in Figure 2 Cable clamp 28, shown enlarged, through which the supporting cable 21 is passed. One end of the support cable 21 is wound on a cable drum 30 which is rotatably mounted in a storage area. In the exemplary embodiment shown, the storage area is located in a shaft base 31 of the shaft 12. Alternatively, the storage area could also be arranged outside the shaft 12, for example in an adjoining room.

To operate the elevator system 10, the suspension cable 21 can be clamped by means of the cable clamp 28. This makes it possible to move the car 23 up and down. To guide the elevator car 23 and the counterweight 25 in the shaft 12, the elevator system 10 has guide rails mounted in the shaft, which are known per se to the person skilled in the art and therefore to achieve a better overview in FIG Figure 1 are not shown.

As already mentioned, the elevator system 10 can be installed in the shaft of a building under construction. As the construction progresses, the elevator installation 10 in the shaft 12 can be gradually moved upwards in the vertical direction. For this purpose, the machine room 14 can be raised after the fastening members 15 and 16 have been removed from it in FIG Figure 1 shown stop position were transferred to a release position. In a higher position, the machine room 14 can then again be in the shaft 12 be fixed by means of the fastening members 15, 16. When the machine room 12 is moved, the cable clamp 28 is released, so that the supporting cable 21 can be unwound from the cable drum 30 with the required length. After reaching the desired height of the machine room 14, the supporting rope 21 can be clamped again by means of the rope clamp 28.

The cable clamp 28 comprises a housing-like support device 34 with two vertically upwardly extending support arms 35, 36, which extend over two in Figure 3 connecting links 37, 38 are rigidly connected to one another. The support arms 35, 36 and connecting members 37, 38 surround a wedge receptacle 40 of the support device 34 which extends through the support device 34 in the vertical direction and in which a clamping device in the form of a clamping wedge 43 is movably arranged. Facing the wedge seat 40, the support arm 35 has a first support surface 45 and the support arm 36 has a second support surface 46 facing the wedge seat 40. The clamping wedge 43 comprises a first clamping surface 48, which lies opposite the first support surface 45, and a second clamping surface 49, which lies opposite the second support surface 46. The first support surface 45 and the first clamping surface 48 are aligned vertically and in alignment with the section of the support cable 21 connecting the cable drum 30 to the cable clamp 28, whereas the second support surface 46 and the second clamping surface 49 are inclined to the vertical, so that the clamping wedge 43 continuously widened from a lower end surface 51 to an upper end surface 52. A deflection device 54 is arranged on the upper end surface 52 with a deflection roller 55 which is rotatably mounted on a bearing block 57 rigidly connected to the clamping wedge 43.

A first clamping area 59 of the cable clamp 28 extends between the first support surface 45 and the first clamping surface 48, and a second clamping area 60 of the cable clamp 28 extends between the second support surface 46 and the second clamping surface 49 guided vertically through the first clamping area 59, from the first clamping area 59 the support cable 21 is guided over the deflection roller 55 to the second clamping area 60, from which the support cable 21 a first deflection element 62 and a second deflection element 63 are reached. The support cable 21 runs vertically downward from the second deflection element 63 to a third deflection element 65, which is held on the upper side of the car 23. From the third deflection element 65, the support cable 21 runs vertically upwards to the traction sheave 19 and to a fourth deflection element 66, from which the support cable 21 is guided vertically downwards to a fifth deflection element 68 held on the counterweight 25. From the fifth deflection element 68, the support cable 21 runs in the vertical direction upwards to a cable fastening 70 arranged on the machine room 14.

The clamping wedge 43 is pressed vertically downward by its weight, so that it rests on the supporting cable 21 in the second clamping region 60. The support cable 21 is loaded by the car 23 on train. The consequence of this is that the clamping wedge 43 is automatically moved vertically downward into a clamping position due to the frictional force which forms between it and the supporting cable 21, in which it clamps the supporting cable 21 both in the first clamping region 59 and in the second clamping region 60.

To release the cable clamp 28, a release device is arranged below the lower end face 51 of the clamping wedge 43, which in the exemplary embodiment shown is designed as a hydraulically actuatable piston-cylinder unit 72. With the aid of the piston-cylinder unit 72, the clamping wedge 43 can be raised so that it changes from its clamping position into a release position. In the release position of the clamping wedge 43, the support cable 21 can run through the cable clamp 28, so that when the elevator system 10 is moved in the shaft 12, the effective length of the support cable 21 can be increased, as already explained above.

How from Figure 3 it becomes clear that the support surfaces 45, 46 and the clamping surfaces 48, 49 can be positively placed on the supporting cable 21. For this purpose, they each have a groove-shaped depression 74, 75. The form-fitting contact of the support and clamping surfaces 45, 46, 48, 49 on the supporting cable 21 ensures that the supporting cable 21 can also be used after repeated clamping and releasing experiences no impairment of its mechanical resilience. The deflection of the suspension cable between the first clamping area 59 and the second clamping area 60 by means of the deflection device 54 takes place with a relatively large bending radius, so that the bending load on the suspension cable 21 can be kept low. For this purpose, the diameter of the deflection roller 55 is greater than the distance that the two clamping regions 59, 60 have from one another at the level of the upper end surface 52.

By using the deflection device 54, the supporting cable 21 can be clamped to two clamping areas 59, 60, which are arranged at the same height in the vertical direction. This gives the cable clamp 28 a particularly compact design, so that it requires only a very small installation space in the machine room 14 of the elevator system 10.

Claims (15)

1. Cable clamp for a cable of an elevator system (10), in particular for a support cable (21) of an elevator system (10) which is installed in a shaft (12) of a building under construction, having a bearing unit (34) which has a wedge mount (40), having a first bearing face (45) and a second bearing face (46) which is disposed at an angle to the first bearing face (45), and having a wedge-shaped clamping unit (43) which is movable to-and-fro in the wedge mount (41) between a clamping position and a releasing position wherein the cable clamp (28) comprises a deflection unit (54) and a first clamping region (59), which is disposed between a first clamping face (48) and the first bearing face (45), and a second clamping region (60) which is disposed between the second clamping face (49) and the second bearing face (46), wherein the cable to be clamped is guidable between the two clamping regions (59, 60) and by means of the deflection unit (54) is deflectable from the first clamping region (59) to the second clamping region (60) and wherein the two clamping faces (48, 49) are obliquely oriented in relation to one another, characterized in that,
   the wedge-shaped clamping unit has the first clamping face (48) which is opposite the first bearing face (45) and the second clamping face (49) which is opposite the second bearing face (46)
2. Cable clamp according to Claim 1, characterized in that the two clamping regions (59, 60) in the use position of the cable clamp are disposed at the same height in relation to the vertical.
3. Cable clamp according to Claim 1 or 2, characterized in that the clamping unit has a clamping wedge (43).
4. Cable clamp according to Claim 1, 2, or 3, characterized in that the deflection unit (54) is held on the clamping unit (43).
5. Cable clamp according to one of the preceding claims, characterized in that the deflection unit (54) has a rotatably mounted deflection roller (55).
6. Cable clamp according to Claim 5, characterized in that the diameter of the deflection roller (55) is at least as large as the spacing between the ends of the two clamping regions (59, 60) which face the deflection roller.
7. Cable clamp according to one of the preceding claims, characterized in that the two bearing faces (45, 46) and the two clamping faces (48, 49) have groove-shaped depressions (74, 75) which are placeable against the cable surface.
8. Cable clamp according to Claim 7, characterized in that the depressions (74, 75) are placeable in a form-fitting manner against the cable surface.
9. Cable clamp according to one of the preceding claims, characterized in that for loosening the cable clamping action, the cable clamp (28) has a manually, electrically, pneumatically or hydraulically actuatable releasing unit.
10. Cable clamp according to Claim 9, characterized in that the releasing unit has a piston-and-cylinder assembly (72) which is impingeable by a pressure means.
11. Cable clamp according to one of the preceding claims, characterized in that the bearing unit (34) has two bearing arms (35, 36) which are rigidly interconnected by way of two connection members (37, 38) and in each case define one bearing face (45, 46), and that the clamping unit has a clamping wedge (43) which is disposed between the two bearing arms (35, 36) and the two connection members (37, 38) and which comprises two clamping faces (48, 49) which in each case face one bearing face (45, 46).
12. Elevator system having a drive unit (18) which by way of a support cable (21) is linked to a car (23) which is upwardly and downwardly displaceable in a vertical shaft (12), and having a cable drum (30) onto which an end portion of the support cable (21) is wound, and having a cable clamp (28) according to one of the preceding claims.
13. Elevator system according to Claim 12, characterized in that the cable drum (30) is disposed in a storage region within or outside the shaft (12).
14. Elevator system according to Claim 12 or 13, characterized in that the drive unit (18) and the cable clamp (28) are disposed in a machine room (14) of the elevator system (10) which is temporarily fixed in the shaft (12).
15. Elevator system according to Claim 12, 13, or 14, characterized in that the support cable (21) is guided via at least one deflection element (62, 63) to a clamping region (60) of the cable clamp (28).

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