Construction elevator with extended lift

Abstract

Provided is a construction elevator with extended headroom, which can equalize the tension of multiple suspension bodies, thereby preventing damage to the suspension bodies or the equipment supporting the suspension bodies. The construction elevator with extended headroom comprises a machine room unit (3) hoisted relative to a building, multiple rope drums (6) mounted on the machine room unit (3), and a second direction conversion wheel (13) having multiple ropes (5) wound thereon and hoisted independently of the machine room unit (3). The multiple ropes (5) are wound on corresponding rope drums (6) among the multiple rope drums (6) respectively. A rotation suppression device (21) is arranged on each rope drum (6). Each rotation suppression device (21) is configured to allow rotation of the rope drum (6) when the rotation torque acting on the rope drum (6) exceeds a set value, and to suppress rotation of the rope drum (6) when the rotation torque is below the set value.

Description

Technical Field

[0001] This invention relates to a construction elevator with extended head. Background Technology

[0002] Patent Document 1 discloses a rope release device for a construction elevator. The rope release device includes a frame and multiple drum holders mounted on the frame. Each drum holder holds a drum on which a rope for suspending a car is wound. A stop bolt is provided between the frame and the drum holders to prevent rotation of the drum holders and the drums. To release the rope, the stop bolt is removed. After the required amount of rope has been released, the stop bolt is reinstalled to prevent rotation of the drums.

[0003] Patent Document 2 discloses a construction elevator with an extended lift, different from the aforementioned construction elevator. This extended lift construction elevator has a machine room unit capable of moving up and down the shaft. The machine room unit houses a traction machine and multiple rope drums. Ropes released from each rope drum are wound around the car's sheaves via multiple direction-changing pulleys. Each rope, after being wound around the car's sheaves, is wound around the traction machine's sheaves. Each rope, after being wound around the traction machine's sheaves, is wound around the counterweight's sheaves. Each rope, after being wound around the counterweight's sheaves, is connected to the machine room unit.

[0004] One of the multiple directional control pulleys can move vertically within the hoistway independently of the machine room unit. When extending the car's lifting stroke, only this one directional control pulley is lifted before the machine room unit and the car are raised. When only this one directional control pulley is lifted, a rope is released from the rope drum. Then, the machine room unit and the car are raised, thereby extending the car's lifting stroke.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2005-82256

[0008] Patent Document 2: Japanese Patent No. 6750754

[0009] If the rope release device of Patent Document 1 is applied to the extended-lift construction elevator of Patent Document 2, the following steps can be considered when extending the lifting stroke of the car.

[0010] First, remove the stop bolts from each of the multiple drum retainers. This allows rotation of each rope drum. Next, before lifting the machine room unit and the car, lift the direction change wheel. This releases the rope from each rope drum. Next, install the stop bolts on each drum retainer. This stops rotation of each rope drum. Next, lift the machine room unit and the car.

[0011] However, if, as described above, the rotation of each rope drum is prevented when the machine room unit is being lifted, the tension of multiple ropes cannot be balanced, and a portion of the tension of the ropes other than one rope is transferred to that single rope. In this case, there is a problem: due to the increased tension in one rope, the rope or the equipment supporting the rope is prone to damage. Summary of the Invention

[0012] The present invention was made to solve the aforementioned problems, and its purpose is to provide a construction elevator with extended lift that can equalize the tension of multiple suspended bodies, thereby suppressing damage to the suspended bodies or the equipment supporting the suspended bodies.

[0013] The extended-lift construction elevator of the present invention comprises: a machine room unit that is lifted relative to a building; a plurality of suspension drums mounted on the machine room unit; and a direction-changing device having the plurality of suspensions wound around it and being lifted independently of the machine room unit, wherein the plurality of suspensions are respectively wound around a corresponding suspension drum among the plurality of suspension drums, and each suspension drum is provided with a rotation suppression device, each of the rotation suppression devices being configured to allow rotation of the suspension drum when the rotational torque acting on the suspension drum exceeds a set value, and to suppress rotation of the suspension drum when the rotational torque is below the set value.

[0014] Invention Effects

[0015] According to the present invention, the tension of multiple suspension bodies can be equalized, thereby suppressing damage to the suspension bodies or the equipment supporting the suspension bodies. Attached Figure Description

[0016] Figure 1 This is a schematic diagram showing the structure of the extended-lift construction elevator according to Embodiment 1.

[0017] Figure 2 This is a perspective view showing the structure of the rope drum and rotation suppression device of the extended-lift construction elevator according to Embodiment 1.

[0018] Figure 3 This is an exploded perspective view showing the structure of the rotation suppression device for the extended-lift construction elevator of Embodiment 1.

[0019] Figure 4 This is a front view showing a construction example of the machine room unit of the extended-lift construction elevator according to Embodiment 1.

[0020] Figure 5 yes Figure 4 A partial side view of the computer room unit shown.

[0021] Label Explanation

[0022] 1: First lifting body; 2: Second lifting body; 3: Machine room unit; 4: Rope pulley; 5: Rope; 6: Rope drum; 6a: Cylindrical section; 6b, 6c: Drum flange; 7: Connecting device; 8: First direction conversion pulley; 9: Fourth direction conversion pulley; 10: Rope holding device; 11: Shackle-side rope end; 12: First lifting device; 13: Second direction conversion pulley; 14: Third direction conversion pulley; 15: Traction machine; 16: Control panel; 17: Lifting hanger; 21 21: Rotation suppression device; 22: Flange; 23a: First friction plate; 23b: Second friction plate; 24: Disc spring; 25: Adjusting nut; 26: Arm; 27: Rotating shaft; 27a, 27b: Supported part; 27c: End; 27d: Stepped surface; 27e: External thread part; 28: Frame; 28a: Upper surface; 29a, 29b: Bearing; 30: Second lifting device; 31: Lifting body hanging component; 32: Balancing component; 33: Lifting equipment; 34: Chain. Detailed Implementation

[0023] Implementation Method 1

[0024] The extended-lift construction elevator of Embodiment 1 will be described. An extended-lift construction elevator is an elevator whose car's lifting distance is extended sequentially as construction progresses. Figure 1 This is a schematic diagram showing the structure of the extended-lift construction elevator of this embodiment. Figure 1 The interior of the shaft of a building under construction is shown. Figure 1 The vertical direction indicates the vertical direction.

[0025] The first lifting body 1 consists of the elevator car and one of the counterweights. The second lifting body 2 consists of the elevator car and the other of the counterweights. Figure 1 The illustration shows a case where the first lifting body 1 is a car and the second lifting body 2 is a counterweight. In this case, the first lifting body 1 can move up and down in the hoistway along a pair of car guide rails (not shown). Similarly, in this case, the second lifting body 2 can move up and down in the hoistway along a pair of counterweight guide rails (not shown).

[0026] The load of the second lifting body 2 can be supported at the bottom of the hoistway. The second lifting body 2 can be configured, for example, as a buffer placed in the pit. The second lifting body 2 can also be configured to be fixed to the car guide rail or the counterweight guide rail. The second lifting body 2 can also be configured to be fixed to the side of the building under construction.

[0027] Machine room unit 3 is a temporary machine room located above the first lifting body 1 and the second lifting body 2. Machine room unit 3 is lifted relative to the building by a first lifting device 12. Machine room unit 3 can be raised and lowered in the hoistway along at least one of the car guide rails and the counterweight guide rails by being lifted by the first lifting device 12. Machine room unit 3 can be fixed relative to the car guide rails, the counterweight guide rails, or a structure on the side of the building under construction. Machine room unit 3 is equipped with a traction machine 15, a control panel (not shown), and multiple rope drums 6. Multiple ropes 5 are wound on the rope sheaves 4 of the traction machine 15.

[0028] The machine room unit 3 is equipped with, for example, two or more direction conversion devices. In this embodiment, four direction conversion devices are provided: a first direction conversion wheel 8, a second direction conversion wheel 13, a third direction conversion wheel 14, and a fourth direction conversion wheel 9. The first direction conversion wheel 8, the second direction conversion wheel 13, the third direction conversion wheel 14, and the fourth direction conversion wheel 9 are respectively positioned above the traction machine 15. Multiple ropes 5 are wound around the first direction conversion wheel 8, the second direction conversion wheel 13, the third direction conversion wheel 14, and the fourth direction conversion wheel 9.

[0029] In this embodiment, a wheel is used as a direction-changing device. However, as long as the rope 5 can change direction and slide smoothly on the direction-changing device, the direction-changing device may not be a wheel.

[0030] Multiple ropes 5 are wound onto corresponding rope drums 6 in multiple rope drums 6. Each rope drum 6 is configured to release the rope 5. The number of rope drums 6 corresponds to the number of ropes 5 used in the elevator. For example, in the case where the elevator uses 6 ropes 5, 6 rope drums 6 are provided. The ropes 5 pre-wound onto each rope drum 6 have a length sufficient to accommodate the lifting and lowering stroke of the car when the building is completed. Each rope drum 6 is provided with a rotation suppression device 21, which will be described later.

[0031] The machine room unit 3 is equipped with a connecting device 7 and a rope holding device 10. For example, when viewed in the vertical direction, the connecting device 7 and the rope holding device 10 are positioned to overlap with the first lifting body 1. When viewed in the vertical direction, the connecting device 7 and the rope holding device 10 are positioned, for example, near the car guide rail or the counterweight guide rail.

[0032] The connecting device 7 is capable of suspending the first lifting body 1. The connecting device 7 is, for example, a lifting device such as a chain pulley or winch. When the first lifting body 1 is suspended by the connecting device 7, the load of the first lifting body 1 is supported by the machine room unit 3.

[0033] The rope holding device 10 can, for example, hold the rope 5 by clamping it. The rope holding device 10 can hold the rope 5 one by one or multiple ropes simultaneously, for at least the same number of ropes as the number of rope drums 6.

[0034] The first direction changer 8 is, for example, located near the rope drum 6, and is the first to receive the rope 5 released from each rope drum 6. The first direction changer 8 can be positioned anywhere relative to the rope drum 6, either up, down, left, or right. Figure 1 In the example shown, a first direction conversion wheel 8 is positioned above the rope reel 6. The first direction conversion wheel 8 is, for example, fixed to the frame of the machine room unit 3.

[0035] The function of the first direction-changing pulley 8 is to change the direction of the rope 5 and guide the rope 5 in a manner that does not interfere with other equipment. When the rope 5 is released from each rope drum 6, the rope 5 reciprocates along the axis of the rope drum 6. By placing the first direction-changing pulley 8 near the rope drum 6, the range of movement of the rope 5 can be suppressed.

[0036] The second direction-changing wheel 13 is a movable direction-changing device. The second direction-changing wheel 13 is lifted independently of the machine room unit 3 by the second lifting device 30. The second direction-changing wheel 13 is lifted from the machine room unit 3 by the second lifting device 30. The second direction-changing wheel 13 is guided, for example, by at least one of a car guide rail and a counterweight guide rail. The second direction-changing wheel 13 can be fixed to a structure within the machine room unit 3 or the hoistway. Structures within the hoistway include, for example, car guide rails, counterweight guide rails, and structures on the side of the building under construction.

[0037] The function of the second direction conversion pulley 13 is to change the direction of the rope 5 and to enable the rope 5 to be pulled out from each rope drum 6 before the machine room unit 3 is lifted. That is, when the lifting stroke of the car is extended, the second direction conversion pulley 13 is lifted before the machine room unit 3 is lifted.

[0038] By setting the second direction conversion wheel 13, the first direction conversion wheel 8 can be omitted if the rope 5 will not interfere with other equipment in the machine room unit 3 even without the first direction conversion wheel 8.

[0039] The third direction conversion wheel 14 is configured such that the rope 5 between the second direction conversion wheel 13 and the fourth direction conversion wheel 9 passes through it. The third direction conversion wheel 14 is fixed to the frame of the machine room unit 3, for example. For example, when viewed in the vertical direction, the third direction conversion wheel 14 is positioned on the side of the second lifting body 2 relative to the sling of the first lifting device 12.

[0040] For example, when viewed vertically, the fourth direction conversion wheel 9 is positioned overlapping with the first lifting body 1. The fourth direction conversion wheel 9 is, for example, positioned horizontally near a pair of car guide rails or a pair of reused guide rails. The fourth direction conversion wheel 9 is, for example, fixed to the frame of the machine room unit 3.

[0041] The function of the fourth direction conversion pulley 9 is to change the direction of the rope 5 and determine the position where the rope 5 descends vertically toward the sheave of the first lifting body 1. The fourth direction conversion pulley 9 is mainly located above the sheave of the first lifting body 1. If the fourth direction conversion pulley 9 can also perform the function of the third direction conversion pulley 14, the third direction conversion pulley 14 may not be provided.

[0042] The ropes 5 released from each rope drum 6 are first wound onto the first direction changer 8. After being wound onto the first direction changer 8, each rope 5 is wound onto the second direction changer 13. After being wound onto the second direction changer 13, each rope 5 is wound onto the third direction changer 14. After being wound onto the third direction changer 14, each rope 5 is wound onto the fourth direction changer 9.

[0043] After being wound around the fourth direction conversion pulley 9, each rope 5 passes through the rope holding device 10. After passing through the rope holding device 10, each rope 5 is wound around the sheave of the first lifting body 1. After being wound around the sheave of the first lifting body 1, each rope 5 is wound around the rope sheave 4 of the traction machine 15.

[0044] Each rope 5, after being wound around the sheave 4 of the traction machine, is wound around the sheave of the second lifting body 2. After being wound around the sheave of the second lifting body 2, each rope 5 is connected to the machine room unit 3. The end of each rope 5 is connected to the machine room unit 3, for example, via an independent shackle. The shackle-side rope end 11 is located, for example, at the lower end of the machine room unit 3.

[0045] The rope holding device 10 is capable of holding the rope 5 located between the rope drum 6 and the sheave of the first lifting body 1. When the first lifting body 1 is not suspended by the connecting device 7 and the rope 5 is held by the rope holding device 10, the loads of the first lifting body 1 and the second lifting body 2 are applied to the rope 5. When the traction machine 15 is driven in this state, the first lifting body 1 and the second lifting body 2 move within a range below the machine room unit 3 in the shaft of the building under construction. This range is the lifting stroke of the first lifting body 1 and the second lifting body 2 at that moment. The traction machine 15 is controlled, for example, by a control panel mounted on the machine room unit 3.

[0046] By repeatedly performing the lifting extension action described later, the lifting stroke of the first lifting body 1 and the second lifting body 2 is extended as the construction progresses.

[0047] (Rotation suppression device)

[0048] The rotation suppression device 21 installed on each rope drum 6 will be described. Due to the tension of the rope 5, a rotational torque acts on the rope drum 6. The rotation suppression device 21 is configured to allow rotation of the rope drum 6 when the rotational torque exceeds a set value, and to suppress rotation of the rope drum 6 when the rotational torque is below the set value. The rotation suppression device 21 is, for example, a torque-applying device that applies a braking torque to the rope drum 6.

[0049] Figure 2 This is a perspective view showing the structure of the rope drum and rotation suppression device of the extended-lift construction elevator of this embodiment. Figure 3 This is an exploded perspective view showing the structure of the rotation suppression device for the extended-lift construction elevator of this embodiment.

[0050] Each rope reel 6 has a cylindrical portion 6a and a pair of reel flanges 6b and 6c. A rope 5 is wound around the cylindrical portion 6a. The reel flange 6b is fixed to one axial end of the cylindrical portion 6a. The reel flange 6c is fixed to the other axial end of the cylindrical portion 6a. The reel flanges 6b and 6c are each formed in a circular plate shape. The reel flanges 6b and 6c each have a diameter larger than the diameter of the cylindrical portion 6a.

[0051] A rotating shaft 27 is fixed to the rope drum 6. The rotating shaft 27 is a shaft component that passes through the center of the rope drum 6. The rotating shaft 27 rotates integrally with the rope drum 6. The rotating shaft 27 has a supported portion 27a and a supported portion 27b, the supported portion 27a being provided at one end of the rotating shaft 27, and the supported portion 27b being provided at the other end of the rotating shaft 27. In addition, the rotating shaft 27 has an end portion 27c, which extends further to one end than the supported portion 27a.

[0052] The supported portion 27a of the rotating shaft 27 is supported by bearing 29a. The supported portion 27b of the rotating shaft 27 is supported by bearing 29b. Bearings 29a and 29b are fixed to the frame 28. Thus, the rotating shaft 27 is rotatably supported on the frame 28 by means of bearings 29a and 29b. The frame 28 is fixed to the frame of the computer room unit 3.

[0053] The end 27c of the rotating shaft 27 has a diameter smaller than that of the supported portion 27a. An annular stepped surface 27d is formed between the supported portion 27a and the end 27c. An external thread 27e is formed at the end 27c.

[0054] A rotation suppression device 21 is installed at the end 27c of the rotating shaft 27. The rotation suppression device 21 has a first friction plate 23a, a flange 22, a second friction plate 23b, a disc spring 24, and an adjusting nut 25. The first friction plate 23a, flange 22, second friction plate 23b, disc spring 24, and adjusting nut 25 are arranged sequentially from the rope drum 6 side. Through holes are formed in the first friction plate 23a, flange 22, second friction plate 23b, and disc spring 24, through which the end 27c passes. An external thread 27e is embedded in the adjusting nut 25.

[0055] The first friction plate 23a faces one side of the flange 22. The second friction plate 23b faces the other side of the flange 22. The first friction plate 23a and the second friction plate 23b are preferably formed of a material with excellent wear resistance.

[0056] Arm 26 is fixed to flange 22. Arm 26 abuts against the upper surface 28a of frame 28. This restricts the rotation of arm 26 and flange 22 about axis 27.

[0057] The first friction plate 23a, flange 22, second friction plate 23b, and disc spring 24 are sandwiched between the stepped surface 27d and the adjusting nut 25. When the adjusting nut 25 is tightened relative to the rotation axis 27, the disc spring 24 is compressed. The amount of compression of the disc spring 24 is adjusted by the adjusting nut 25.

[0058] The compressive load of the disc spring 24 acts on the first friction plate 23a, the flange 22, and the second friction plate 23b. As a result, the first friction plate 23a is pressed against one surface of the flange 22, generating friction between the first friction plate 23a and the flange 22. Furthermore, the second friction plate 23b is pressed against the other surface of the flange 22, generating friction between the second friction plate 23b and the flange 22. Additionally, the first friction plate 23a is pressed against the stepped surface 27d, and the second friction plate 23b is pressed against the disc spring 24.

[0059] When the rope drum 6 and the rotating shaft 27 rotate, torque is transmitted from the rotating shaft 27 to the flange 22 and the arm 26 using the friction between the first friction plate 23a and the flange 22, and the friction between the second friction plate 23b and the flange 22. Since the arm 26 abuts against the upper surface 28a of the frame 28, the torque transmitted to the arm 26 is absorbed by the frame 28. The reaction force of this torque acts on the rotating shaft 27. Therefore, braking torque is always applied to the rotating shaft 27 and the rope drum 6.

[0060] In this embodiment, the rotation suppression device 21 is mounted on the rotating shaft 27. Therefore, the construction is simplified, and a stable braking torque can be applied to the rope drum 6. However, the rotation suppression device 21 can also be mounted on other parts of the rope drum 6, as long as the braking torque can be applied to it. For example, the rotation suppression device 21 can also be mounted on the drum flange 6b or the drum flange 6c of the rope drum 6.

[0061] (Lift extension action)

[0062] When extending the lifting stroke of the first lifting body 1 and the second lifting body 2, i.e., the lift of the traction machine 15, the first lifting body 1 is first connected to the machine room unit 3 using the connecting device 7. Thus, the load of the first lifting body 1 is supported in the machine room unit 3 via the connecting device 7. The load of the second lifting body 2 is supported in the lower part of the shaft. That is, the extension of the lifting stroke is carried out without the loads of the first lifting body 1 and the second lifting body 2 being applied to the rope 5.

[0063] The extension of the lifting stroke is achieved by lifting the machine room unit 3 and the first lifting body 1 using the first lifting device 12 while the rope 5 is not held by the rope holding device 10. The first lifting device 12 is, for example, a tower crane or a winch. For operational safety, the lifting of the machine room unit 3 and the first lifting body 1 is carried out with the slings of the first lifting device 12 gripping the center of gravity of the object being lifted.

[0064] In this embodiment, when the lifting stroke is extended, the second direction conversion wheel 13 is lifted from the machine room unit 3 before the machine room unit 3 and the first lifting body 1 are lifted. The lifting of the second direction conversion wheel 13 is performed using a second lifting device 30, which is different from the first lifting device 12. The second lifting device 30 is, for example, a winch. The second lifting device 30 is positioned above the position predetermined as the next fixed position of the machine room unit 3. The second direction conversion wheel 13 is lifted together with the multiple ropes 5 wound around it.

[0065] The second direction conversion pulley 13 is lifted while multiple ropes 5 are held by the rope holding device 10. When the second direction conversion pulley 13 is lifted from the machine room unit 3 in this state, the ropes 5 are released from each rope drum 6. Each rope 5 is released a predetermined length through the first direction conversion pulley 8 and the second direction conversion pulley 13. The lifted second direction conversion pulley 13 is fixed to a structure within the shaft, for example, near the next fixed position of the machine room unit 3.

[0066] Then, the rope holding device 10 releases its grip on the multiple ropes 5. With the multiple ropes 5 unheld, the machine room unit 3 and the first lifting body 1 are lifted using the first lifting device 12. As a result, the ropes 5, which have been released from each rope drum 6, descend downwards from the machine room unit 3 via the third direction conversion pulley 14, the fourth direction conversion pulley 9, the sheave of the first lifting body 1, and the rope sheave 4 of the traction machine 15.

[0067] The second lifting body 2 remains supported at the bottom of the shaft. The length of the rope 5 located below the machine room unit 3 increases according to the lifting amount of the machine room unit 3 and the first lifting body 1. The machine room unit 3, having reached the target floor, is fixed to the car guide rails, counterweight guide rails, or a structure on the building side. As a result, the lifting stroke of the first lifting body 1 and the second lifting body 2 is extended. This extension of the lifting stroke is repeated during construction.

[0068] (Effect of the rotation suppression device)

[0069] The first function of the rotation suppression device 21 is to prevent the ropes 5 from falling during the lifting of the machine room unit 3 and the first lifting body 1 by the first lifting device 12. When the rope drum 6 is installed in the machine room unit 3, tension is generated on the side of the rope drum 6 due to the weight of the ropes 5. A portion of the weight of the ropes 5 becomes the tension component in the direction in which the ropes 5 are released from the rope drum 6. The remaining portion of the weight of the ropes 5 becomes the tension component in the direction in which the ropes 5 are pulled to the end on the opposite side of the rope drum 6. A portion of each of these tension components cancels each other out. The tension component of the uncancelled imbalance caused by the weight of the ropes 5 becomes the tension acting on the rope drum 6.

[0070] Therefore, if the rotation of the rope drum 6 is not suppressed, the rope 5 will be excessively released from the rope drum 6, causing the rope 5 to fall. Thus, the condition that the rotation of the rope drum 6 can be suppressed by the rotation suppression device 21 even when tension corresponding to the weight of the rope 5 is applied to the rope 5 is applied.

[0071] The second function of the rotation suppression device 21 is to prevent the load from concentrating on one of the multiple ropes 5, thus preventing a significant increase in the tension of that single rope 5. When any pulley among the pulleys through which the multiple ropes pass is not independent for each rope, and when traction is generated between that pulley and each of the multiple ropes, the tension of one rope may be transferred to other ropes via the pulley. The greater the traction between the pulley and the rope, the less likely slippage will occur between the pulley and the rope, and the stronger the tendency for the pulley and rope to become integrated. Therefore, the greater the traction between the pulley and each rope, the greater the load transferred from one rope to other ropes. Here, the pulleys include the sheaves of the traction machine and multiple direction-changing pulleys. The power of the traction machine is transmitted to each rope via the sheaves. Therefore, in particular, the traction between the sheaves of the traction machine and each rope is ensured to be large.

[0072] Furthermore, which rope 5 experiences load concentration is determined by a combination of factors, including the tension and slack of each rope 5 before the machine room unit 3 is lifted, the magnitude of the traction force between each rope 5 and the pulley, the path difference between each rope 5, and the difference in the rotation margin of each rope drum 6. Therefore, while it is possible to increase the probability of load concentration at any rope point to some extent on-site, it is conversely difficult to make adjustments on-site to prevent load concentration altogether.

[0073] Regulations in various countries for the safe use of elevator ropes specify a safety factor for the ropes. While the value of the safety factor varies from country to country, it is generally 12 or higher for the breaking load of the rope. That is, to ensure the safety of each rope 5, the load on each rope 5 must not exceed a load with a safety factor of 12. Therefore, if a load is concentrated on a particular rope 5, exceeding the safety factor of 12, and thus applied to that rope 5, rotation of the rope drum 6 corresponding to that rope 5 must be permitted so that the tension of that rope 5 does not exceed a specified value.

[0074] Based on the above, in each rope drum 6, the setting value of the braking torque applied to the rope drum 6 by the rotation suppression device 21 is set within the range between the lower and upper limits described below. The setting value of the braking torque can be any value as long as it falls within the lower and upper limits. The setting value of the braking torque can be adjusted using the adjusting nut 25. When the adjusting nut 25 is tightened, the setting value of the braking torque increases; when the adjusting nut 25 is loosened, the setting value of the braking torque decreases.

[0075] The lower limit of the braking torque is equal to the value of the rotational torque generated by the weight of the unbalanced amount of one rope 5 on the rope drum 6.

[0076] The upper limit of the braking torque is equal to the value of the rotational torque generated in the rope drum 6 when a load, defined as a safety factor in national regulations, is applied to one rope 5. Alternatively, in cases where there is equipment that may be damaged before the rope 5, the upper limit of the braking torque may also be equal to the value of the rotational torque generated in the rope drum 6 when a limit of tension, at which the equipment will not be damaged, is applied to one rope 5.

[0077] When the second direction conversion wheel 13 is lifted from the machine room unit 3, a tensile force is applied to the rope 5, and this tensile force is transmitted to the rope drum 6. If the braking torque setting of the rotation suppression device 21 is within the aforementioned range, the rotational torque generated by the tensile force exceeds the braking torque. Therefore, the rope drum 6 rotates, and the rope 5 is released from the rope drum 6.

[0078] On the other hand, when the machine room unit 3 and the first lifting body 1 are lifted, the rotational torque acting on the rope drum 6 is basically below the braking torque of the rotation suppression device 21. Therefore, the rotation of the rope drum 6 is suppressed by the rotation suppression device 21, and the rope 5 is held on the rope drum 6.

[0079] However, a situation may arise where, when the machine room unit 3 and the first lifting body 1 are lifted, the load on one of the ropes 5 increases, causing a rotational torque exceeding the braking torque to act on the corresponding rope drum 6. In this case, the rotation suppression device 21 slides, causing the rope drum 6 to rotate. This releases a small amount of rope 5 from the rope drum 6. Therefore, the increased load is distributed to the other ropes 5, thus equalizing the load acting on each rope 5. The rotation of the rope drum 6 stops when the rotational torque acting on the rope drum 6 becomes below the braking torque of the rotation suppression device 21.

[0080] Even if the lifting operation of the machine room unit 3 and the first elevator 1 is stopped midway up to the next target floor, the load in the direction in which the rope 5 is released from the rope drum 6 is only the tension component generated by the self-weight of the unbalanced rope 5. Therefore, the rotational torque acting on the rope drum 6 is below the braking torque of the rotation suppression device 21. As a result, the rotation of the rope drum 6 is suppressed, and the rope 5 is held in the rope drum 6.

[0081] By installing the rotation suppression device 21 on each rope drum 6, although the load when releasing the rope 5 from the rope drum 6 increases, it is possible to suppress the rope drum 6 from continuing to rotate after the rope 5 has finished being released.

[0082] Furthermore, when the machine room unit 3 and the first lifting body 1 are lifted, if the load on one of the ropes 5 increases, the corresponding rope drum 6 is allowed to rotate. Therefore, excessive tension on the specific rope 5 is prevented. This avoids damage to the rope 5 or the equipment supporting it. Thus, the lift extension operation can be performed safely.

[0083] The weight of the suspended rope 5 and its radial position on the rope drum 6 change whenever the lifting range is extended. In this embodiment, the braking torque setting can be adjusted by tightening or loosening the adjusting nut 25. Therefore, the braking torque setting can be appropriately adjusted in accordance with the changing factors such as the weight of the suspended rope 5 and its radial position on the rope drum 6.

[0084] (Example of the construction of the computer room unit in Implementation Method 1)

[0085] Figure 4 This is a front view showing a construction example of the machine room unit of the extended-lift construction elevator according to this embodiment. Figure 5 yes Figure 4 A partial side view of the computer room unit shown.

[0086] exist Figure 4 and Figure 5 In the example shown, the upper part of the computer room unit 3 is equipped with a first direction conversion wheel 8, a second direction conversion wheel 13, a third direction conversion wheel 14, a fourth direction conversion wheel 9, and 6 rope reels 6. Figure 4 Three rope reels 6 are shown. Three other rope reels 6, not shown, are positioned inside the three rope reels 6 shown.

[0087] In machine room unit 3, there is a traction machine 15, a shackle-side rope terminal 11, a rope holding device 10, and a control panel 16. The control panel 16 is electrically connected to the traction machine 15 and the car equipment.

[0088] The ropes 5 released from each rope drum 6 are first wound around the first direction conversion wheel 8. After each rope 5 is wound around the first direction conversion wheel 8, the second direction conversion wheel 13, the third direction conversion wheel 14 and the fourth direction conversion wheel 9 in sequence, it passes through the rope holding device 10 and goes to the sheave of the first lifting body 1.

[0089] Multiple lifting slings 17 are provided at the upper end of the computer room unit 3. The multiple lifting slings 17 are arranged in a manner that surrounds the center of gravity of the connection between the first lifting body 1 and the computer room unit 3, so that the computer room unit 3 connected to the first lifting body 1 can be lifted at a position close to the center of gravity. The lifting slings 17 are connected to the slings of the first lifting device 12.

[0090] exist Figure 4 and 5 In the example shown, a balancer 32 is suspended from the sling of the first lifting device 12. Lifting devices 33, which have a tension equalization function, are installed at both ends of the balancer 32. Chains 34 are hung on each lifting device 33. Both ends of the chains 34 are connected to lifting hangers 17. Thus, the sling of the first lifting device 12 is connected to the lifting hangers 17 at four locations.

[0091] By suspending the first lifting body 1 and the machine room unit 3 at approximately the center of gravity, the first lifting body 1 and the machine room unit 3 can be lifted stably without generating excessive reaction force on the guide rail. By using the lifting device 33 with tension equalization function, the load at both ends of the chain 34 can be evenly distributed.

[0092] The first elevator body 1 can be as follows Figure 1 It can be suspended from the lower beam of computer room unit 3 as shown, or it can be suspended from the upper beam of computer room unit 3. Figure 5 In the example shown, the first lifting body 1 is suspended from the upper beam of the machine room unit 3. That is, in Figure 5 In the example shown, a lifting body suspension component 31 is installed on the upper beam of the computer room unit 3, and the first lifting body 1 is suspended from the lifting body suspension component 31 via a connecting device 7. When the first lifting body 1 is suspended from the upper beam of the computer room unit 3, it is preferable to install a chain pulley, winch, or similar device between the lifting body suspension component 31 and the first lifting body 1, and within the computer room unit 3. This allows for safe adjustment of the vertical position of the first lifting body 1 within the computer room unit 3.

[0093] As described above, the first lifting body 1 can be a car that moves along the car guide rails, or a counterweight that moves along the counterweight guide rails. When the first lifting body 1 is a car, the second lifting body 2 is the counterweight; when the first lifting body 1 is the counterweight, the second lifting body 2 is the car.

[0094] The car is lighter than the counterweight. Therefore, when the first lifting body 1 is set as the car and the second lifting body 2 is set as the counterweight, the load applied to the first lifting device 12 can be reduced because the car is connected to the machine room unit 3.

[0095] As explained above, the extended-lift construction elevator of this embodiment includes a machine room unit 3, multiple rope drums 6, and a second-direction conversion pulley 13. The machine room unit 3 is lifted relative to the building. Multiple rope drums 6 are mounted on the machine room unit 3. Multiple ropes 5 are wound around the second-direction conversion pulley 13. The second-direction conversion pulley 13 is lifted independently of the machine room unit 3. Here, the rope drums 6 are an example of suspension drums. The ropes 5 are an example of suspension bodies. The second-direction conversion pulley 13 is an example of a direction conversion device.

[0096] Multiple ropes 5 are wound around corresponding rope drums 6 in multiple rope drums 6. Each rope drum 6 is equipped with a rotation suppression device 21. Each rotation suppression device 21 is configured to allow rotation of the rope drum 6 when the rotational torque acting on it exceeds a set value. Each rotation suppression device 21 is configured to suppress rotation of the rope drum 6 when the rotational torque is below the set value.

[0097] In this structure, when the lifting head is extended, the second direction conversion wheel 13 is lifted before the machine room unit 3 is lifted. At this time, the rotational torque acting on the rope drum 6 due to the tension of the rope 5 usually exceeds the set value. Therefore, the rotation of the rope drum 6 is allowed, and the rope 5 is released from the rope drum 6.

[0098] On the other hand, when the machine room unit 3 is lifted, the rotational torque acting on the rope drum 6 is below a set value, suppressing the rotation of the rope drum 6. This prevents the rope 5 from being excessively released from the rope drum 6 and falling.

[0099] Here, when the load on one rope 5 increases and the rotational torque acting on the corresponding rope drum 6 exceeds a set value, rotation of the rope drum 6 is permitted, releasing a small amount of rope 5. This allows the increased load on one rope 5 to be distributed to the other ropes 5, thus equalizing the tension of multiple ropes 5. Therefore, damage to the ropes 5 or the equipment supporting them can be prevented.

[0100] In the extended-lift construction elevator of this embodiment, the rotation suppression device 21 is configured to apply a braking torque corresponding to a set value to the rope drum 6. With this configuration, the aforementioned set value can be easily set.

[0101] In the extended-lift construction elevator of this embodiment, the rotation suppression device 21 is installed on the rotation shaft 27 of the rope drum 6. This structure simplifies the construction and allows for a stable braking torque to be applied to the rope drum 6.

[0102] In the extended-lift construction elevator of this embodiment, the rotation suppression device 21 may also be installed on the drum flange 6b or the drum flange 6c of the rope drum 6.

[0103] In the extended-lift construction elevator of this embodiment, the aforementioned setting value is adjustable. Based on this structure, the setting value can be appropriately set in accordance with various changing factors such as the weight of the suspended rope 5 and the radial position of the rope 5 on the rope drum 6.

[0104] In this embodiment, rope 5 is exemplified as the suspension body, but a belt can also be used as the suspension body.

Claims

1. A construction elevator with extended head, comprising: The computer room unit is lifted relative to the building; Multiple suspended reels, mounted on the computer room unit; and The direction-changing device, which is suspended by multiple suspension bodies, is lifted independently of the machine room unit. The plurality of suspension bodies are respectively wound around corresponding suspension body drums in the plurality of suspension body drums. Each of the aforementioned suspension drums is equipped with a rotation suppression device. Each of the aforementioned rotation suppression devices is configured to allow rotation of the suspension drum when the rotational torque acting on it exceeds a set value, and to suppress rotation of the suspension drum when the rotational torque is below the set value. in, The set value is set within the range between the lower limit and the upper limit. The lower limit value is equal to the value of the first rotational torque, which is generated by the weight of the unbalanced portion of the suspension body on the suspension drum. The upper limit value is equal to the value of the second rotational torque, which is generated on the suspension drum when a load of a specified safety factor is applied to one of the suspension bodies, or, in the case of equipment that is damaged before the suspension body, the second rotational torque is generated on the suspension drum when a limit tension that prevents damage to the equipment is applied to one of the suspension bodies.

2. The extended-lift construction elevator according to claim 1, wherein, The rotation suppression device is configured to apply a braking torque corresponding to the set value to the suspension drum.

3. The extended-lift construction elevator according to claim 2, wherein, The rotation suppression device is installed on the rotation shaft of the suspended drum.

4. The extended-lift construction elevator according to claim 2, wherein, The rotation suppression device is installed on the flange of the suspension drum.

5. The extended-lift construction elevator according to any one of claims 1 to 4, wherein, The set value is adjustable.

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