Machine-room-less traction elevator

Abstract

The present invention discloses a traction machine down-mounted elevator, wherein a pulley block is installed on a support beam at the top of a hoistway; one end of a compensating rope is connected to the top of a car, and after passing upward around the pulley block, the other end is connected downward to the top of a counterweight; a traction rope wound out from a traction sheave has its front end fixedly connected to the bottom of the car and its rear end fixedly connected to the bottom of the counterweight; a traction machine drives the traction sheave through its main shaft; the traction sheave and the traction machine are lifted by the traction rope, are arranged at the bottom of the hoistway and are at a certain distance above the hoistway floor; at least one end of a traction guide rail is fixedly connected to the hoistway floor; a guiding device is provided at the mating position of the traction machine and the traction guide rail, so that the traction machine can freely slide up and down along the traction guide rail. The traction machine down-mounted elevator of the present invention can effectively reduce noise, and the load on the main shaft of the traction machine is relatively small.

Description

Technical Field

[0001] The present invention relates to elevator technology and relates to an elevator with a downward-mounted traction machine. Background Art

[0002] The traction machine is arranged at the top of the hoistway or at the bottom of the hoistway, but the steel wire rope is wound around the upper parts of the car and the counterweight through a winding method and connected thereto. The main shaft load of the traction machine includes the mass of part or the entire elevator system, which has a relatively large impact on the design size of the main shaft, the selection of bearings, and even the size and specifications of the entire traction machine.

[0003] Chinese patent document CN1429173A discloses an elevator device with a traction machine installed at the top of the hoistway. In this arrangement, the main bearing load of the traction machine includes at least the steel wire rope, the balance weight, and the pulley.

[0004] For a downward-mounted traction machine arrangement, additional tensioning of the traction ropes is required to ensure sufficient surface pressure in the rope grooves on the traction wheels to provide traction force. Japanese patent document JP08151180A discloses a lift with a downward-mounted traction machine. In this arrangement, the main machine needs to be fixedly connected to the bottom ground, and in order to prevent the steel wire rope from slackening during the up and down movement of the elevator, a tensioning wheel must be configured.

[0005] In the above-mentioned existing structure where the traction machine is fixed to the hoistway, the vibration generated during the operation of the traction machine will be transmitted to the hoistway structure along the rigid connection components, causing room noise; generally, additional vibration isolation rubber is added for vibration isolation, which increases the cost, and the production of rubber is not environmentally friendly. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an elevator with a downward-mounted traction machine, which can effectively reduce noise and has a relatively small main shaft load of the traction machine.

[0007] To solve the above technical problem, the elevator with a downward-mounted traction machine provided by the present invention includes a pulley block 5, a compensating rope 6, a traction machine 2, and a traction rope 9;

[0008] The pulley block 5 is installed on the support beam 1d at the top 1a of the hoistway;

[0009] One end of the compensating rope 6 is connected to the top of the car 7, and after passing upward around the pulley block 5, the other end is connected downward to the top of the counterweight 8;

[0010] The traction rope 9 wound out from the traction wheel 2b has its front end fixedly connected to the bottom of the car 7 and its rear end fixedly connected to the bottom of the counterweight 8. The traction rope 9 on the front side of the traction wheel 2b is used as the car-side traction rope 9a, and the traction rope 9 on the rear side of the traction wheel 2b is used as the counterweight-side traction rope 9b;

[0011] The traction machine 2 drives the traction wheel 2b through its main shaft;

[0012] The traction sheave 2b and the traction machine 2 are hoisted by a traction rope 9 and are arranged at the bottom 1b of the hoistway and higher than the hoistway floor 1c;

[0013] The elevator with the traction machine placed at the bottom is further provided with a traction guide rail 3;

[0014] At least one end of the traction guide rail 3 is fixedly connected to the hoistway floor 1c;

[0015] A guiding device 4 is arranged at the cooperation position between the traction machine 2 and the traction guide rail 3, so that the traction machine 2 can freely slide up and down along the traction guide rail 3.

[0016] Preferably, the pulley block 5 includes a front pulley 5a and a rear pulley 5b;

[0017] One end of the compensation rope 6 is connected to the top of the car 7, and after passing around the upper sides of the front pulley 5a and the rear pulley 5b in sequence upward, the other end is connected to the top of the counterweight 8 downward.

[0018] Preferably, in the front-rear direction, the vertical projection of the traction machine 2 is located between the vertical projections of the car 7 and the counterweight 8.

[0019] Preferably, in the front-rear direction, the vertical projection of the traction machine 2 is located at the middle position between the vertical projections of the car 7 and the counterweight 8;

[0020] The wrapping angle of the traction rope 9 around the traction sheave 2b is between 170° and 190°.

[0021] Preferably, the elevator with the traction machine placed at the bottom further includes a trailing cable 10;

[0022] The trailing cable 10 is fixedly connected to the bottom of the car 7.

[0023] Preferably, an adjustable counterweight 2a is fixedly arranged on the upper part of the traction machine 2.

[0024] Preferably, the guiding device 4 can be self-locked. When the tensions of the traction rope 9a on the car side and the traction rope 9b on the counterweight side change suddenly, resulting in an upward throwing trend of the traction machine 2, the guiding device 4 can trigger the self-locking function to lock the traction machine 2 from being thrown up.

[0025] Preferably, the elevator with the traction machine placed at the bottom has two left and right traction sheaves 2b and two left and right traction ropes 9;

[0026] The two left and right traction sheaves 2b are coaxial and are driven by the main shaft of the same traction machine 2, and keep synchronous rotation;

[0027] The left traction rope winds out from the left traction sheave and is fixedly connected to the bottom of the car 7 and the bottom of the counterweight 8 at the front and rear ends respectively;

[0028] The right traction rope exits from the right traction sheave and is fixedly connected to the bottom of the car 7 and the bottom of the counterweight 8 at its front and rear ends respectively.

[0029] Preferably, the traction guide rail 3 is arranged between the left and right traction sheaves 2b, or on both sides of the traction machine 2.

[0030] Preferably, a buffer is fixedly installed in the spaced space between the left and right traction sheaves 2b.

[0031] Preferably, the symmetry plane of the left and right traction sheaves 2b is the center plane of the car 7 in the left - right direction.

[0032] Preferably, the traction machine 2 is further fixedly connected with a deflector sheave 2c;

[0033] The deflector sheave 2c is located in front of or behind the traction sheave 2b, and their axes are parallel;

[0034] The car - side traction rope 9a or the counterweight - side traction rope 9b also bypasses the lower side of the deflector sheave 2c.

[0035] In the traction - machine - lower - placed elevator of the present invention, the traction machine 2 is placed below, and the traction machine 2 cooperates with the traction guide rail 3 which is vertically guided and has its bottom connected to the hoistway floor 1c in the pit. It can move up and down freely on the traction guide rail 3 through the guiding device 4, and the traction machine 2 maintains its attitude stable in the horizontal position through the traction guide rail 3; the traction rope 9 winds around the traction sheave 2b from the bottom of the car and the bottom of the counterweight 8 (counterweight frame). The main bearing of the traction machine 2 bears its own weight, and through the tension of the traction rope 9, the traction machine 2 and the traction sheave 2b are hoisted. Since the traction machine 2 and the traction sheave 2b are hoisted by the traction rope 9 and do not directly rigidly contact the hoistway structure such as the hoistway floor or the hoistway wall, the self - weight of the traction machine 2 and the traction sheave 2b can tension the traction rope 9, ensuring that the traction rope 9 is not easily disengaged from the rope groove of the traction sheave 9. Moreover, there is no vibration transmission path between the traction machine 2 and the hoistway 1, which can effectively reduce noise. And since the main - shaft load of the traction machine 2 is only its own weight and is not affected by the weights of other (excluding the traction machine) components of the elevator system, the main - shaft load of the traction machine 2 is relatively small, and the traction machine 2 can adopt a structure design with a smaller volume and lighter weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0037] Figure 1 It is a right - hand side schematic view of an embodiment of the traction - machine - lower - placed elevator of the present invention;

[0038] Figure 2 Front side schematic view of an embodiment of a traction machine under-mounted elevator of the present invention;

[0039] Figure 3 Right side schematic view of the traction rope rewinding of an embodiment of a traction machine under-mounted elevator of the present invention;

[0040] Figure 4 Front side schematic view of two traction wheels of an embodiment of a traction machine under-mounted elevator of the present invention.

[0041] Explanation of the reference numerals in the figure:

[0042] 5 Pulley group; 5a Front pulley; 5b Rear pulley; 6 Compensating rope; 7 Car; 8 Counterweight; 1 Hoistway; 2 Traction machine; 3 Traction guide rail; 4 Guide device; 1a Top of the hoistway; 1b Bottom of the hoistway; 1c Hoistway floor; 1d Support beam; 2b Traction wheel; 2a Counterweight; 2c Guide wheel; 9 Traction rope; 9a Traction rope on the car side; 9b Traction rope on the counterweight side; 10 Traveling cable. Detailed implementation manners

[0043] The technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] Embodiment 1

[0045] As Figure 1 、 Figure 2 shown, the traction machine under-mounted elevator includes a pulley group 5, a compensating rope 6, a traction machine 2, a traction rope 9 and a traction guide rail 3;

[0046] The pulley group 5 is installed on the support beam 1d at the top 1a of the hoistway;

[0047] One end of the compensating rope 6 is connected to the top of the car 7, and after passing upward around the pulley group 5, the other end is connected downward to the top of the counterweight 8;

[0048] The traction rope 9 wound out from the traction wheel 2b has its front end fixedly connected to the bottom of the car 7 and its rear end fixedly connected to the bottom of the counterweight 8. The traction rope 9 on the front side of the traction wheel 2b serves as the traction rope 9a on the car side, and the traction rope 9 on the rear side of the traction wheel 2b serves as the traction rope 9b on the counterweight side;

[0049] The traction machine 2 drives the traction wheel 2b through its main shaft;

[0050] The traction wheel 2b and the traction machine 2 are lifted by the traction rope 9 and are arranged at the bottom 1b of the hoistway and at a certain distance above the hoistway floor 1c;

[0051] At least one end of the traction guide rail 3 is fixedly connected to the hoistway floor 1c;

[0052] There is a guiding device 4 at the mating part of the traction machine 2 and the traction guide rail 3, so that the traction machine 2 can slide up and down freely along the traction guide rail 3.

[0053] In the traction machine under-mounted elevator of the first embodiment, the traction machine 2 is under-mounted. The traction machine 2 cooperates with the traction guide rail 3 that is vertically guided and whose bottom is connected to the hoistway floor 1c at the bottom pit. It can move up and down freely on the traction guide rail 3 through the guiding device 4. The traction machine 2 maintains its attitude stable in the horizontal position through the traction guide rail 3; the traction rope 9 winds down from the bottom of the car and the bottom of the counterweight 8 (counterweight frame) and winds around the traction wheel 2b. The main bearing of the traction machine 2 bears its own weight. Through the tension of the traction rope 9, the traction machine 2 and the traction wheel 2b are suspended. Since the traction machine 2 and the traction wheel 2b are suspended by the traction rope 9, they do not directly rigidly contact the hoistway structure such as the hoistway floor or the hoistway wall. The self-weight of the traction machine 2 and the traction wheel 2b can tension the traction rope 9, ensuring that the traction rope 9 is not easily disengaged from the rope groove of the traction wheel 9. Moreover, there is no vibration transmission path for the traction machine 2 relative to the hoistway 1, which can effectively reduce noise. And since the main shaft load of the traction machine 2 is only its own weight and is not affected by the weights of other (excluding the traction machine) components of the elevator system, the main shaft load of the traction machine 2 is relatively small, and the traction machine 2 can adopt a structure design with a smaller volume and lighter weight.

[0054] Embodiment Two

[0055] Based on the traction machine under-mounted elevator of the first embodiment, in the front-back direction, the vertical projection of the traction machine 2 is located between the vertical projections of the car 7 and the counterweight 8.

[0056] Preferably, in the front-back direction, the vertical projection of the traction machine 2 is located at the middle position between the vertical projections of the car 7 and the counterweight 8;

[0057] The wrapping angle of the traction rope 9 around the traction wheel 2b is between 170° and 190° (for example, 180°).

[0058] Preferably, the pulley block 5 includes a front pulley 5a and a rear pulley 5b;

[0059] One end of the compensation rope 6 is connected to the top of the car 7. After winding up and passing over the upper sides of the front pulley 5a and the rear pulley 5b in sequence, the other end is connected downward to the top of the counterweight 8.

[0060] Preferably, the traction machine under-mounted elevator further includes a trailing cable 10;

[0061] The trailing cable 10 is fixedly connected to the bottom of the car 7.

[0062] Embodiment Three

[0063] For the traction machine down - mounted elevator based on Embodiment 1, an adjustable counterweight 2a is fixedly arranged on the upper part of the traction machine 2 to adjust the self - weight of the traction machine 2 and the tensioning effect.

[0064] For the traction machine down - mounted elevator of Embodiment 3, the traction capacity is controllable. An adjustable counterweight 2a is added to the traction machine 2 to adjust the surface pressure between the traction rope 9 and the traction wheel 2b, thereby controlling the traction force.

[0065] Embodiment 4

[0066] For the traction machine down - mounted elevator based on Embodiment 1, the guiding device 4 can be self - locked. When the tensions of the car - side traction rope 9a and the counterweight - side traction rope 9b change suddenly, resulting in an upward - throwing trend of the traction machine 2 and the traction wheel 2b, the guiding device 4 can trigger the self - locking function to lock the traction machine 2 and the traction wheel 2b from being thrown up.

[0067] For the traction machine down - mounted elevator of Embodiment 5, the guiding device 4 of the traction machine 2 can be provided with a self - locking device, which can be self - locked with the traction guide rail 3. Once the difference in tensions at both ends of the traction rope 9 changes suddenly, it can avoid the problem that the traction machine 2 and the traction wheel 2b are separated from the traction rope 9 due to the upward - throwing trend, resulting in the disappearance of the traction force.

[0068] Embodiment 5

[0069] For the traction machine down - mounted elevator based on Embodiment 1, as Figure 4 shown, the traction machine down - mounted elevator has two left and right traction wheels 2b and two left and right traction ropes 9;

[0070] The two left and right traction wheels 2b are coaxial and driven by the main shaft of the same traction machine 2, and keep synchronous rotation;

[0071] The left traction rope winds out from the left traction wheel and is fixedly connected to the bottom of the car 7 and the bottom of the counterweight 8 at its front and rear ends respectively;

[0072] The right traction rope winds out from the right traction wheel and is fixedly connected to the bottom of the car 7 and the bottom of the counterweight 8 at its front and rear ends respectively;

[0073] The two left and right traction ropes 9 have the same weight.

[0074] Preferably, the traction guide rail 3 is arranged between the two left and right traction wheels 2b or on both sides of the traction machine 2.

[0075] Preferably, a buffer is fixedly installed in the spaced space between the two left and right traction wheels 2b.

[0076] Preferably, the symmetry plane of the two left and right traction wheels 2b is the center plane of the car 7 in the left - right direction.

[0077] The traction machine under-mounted elevator of Embodiment 5 is provided with two traction wheels 2b on the left and right. Even when the elevator has a high lifting height and is restricted by the car balance and the guide shoe reaction force, the traction rope 9 will not deviate too far from the central plane of the car 7 in the left-right direction, and at the same time, it can avoid the components installed in the hoistway pit, such as buffers.

[0078] Embodiment 6

[0079] Based on the traction machine under-mounted elevator of Embodiment 1, as Figure 3 shown, the traction machine 2 is also fixedly connected with a guide wheel 2c;

[0080] The guide wheel 2c is located in front of or behind the traction wheel 2b, and their axes are parallel;

[0081] The car-side traction rope 9a or the counterweight-side traction rope 9b also bypasses the lower side of the guide wheel 2c.

[0082] To ensure that the traction rope 9 has sufficient traction force on the traction wheel 2b, the traction rope 9 forms a compound winding structure with the traction wheel 2b through the guide wheel 2c, and its equivalent wrap angle is greater than 180°.

[0083] The traction machine under-mounted elevator of Embodiment 6 adds a guide wheel 2c to the main body of the traction machine 2. Through the compound winding structure of the traction rope 9 on the guide wheel 2c and the traction wheel 2b, even if the traction wheel 2b cannot be located in the middle of the car 7 and the counterweight 8, it will not cause insufficient traction force due to the wrap angle of the traction rope 9 on the traction wheel 2b, and the overall traction force of the elevator can be ensured.

[0084] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A traction machine under-mounted elevator, characterized in that, It includes a pulley block (5), a compensating rope (6), a traction machine (2), a traction rope (9) and a traction guide rail (3); The pulley block (5) is installed on a support beam (1d) at the top (1a) of the hoistway; One end of the compensating rope (6) is connected to the top of the car (7), and after passing around the pulley block (5) upwards, the other end is connected downwards to the top of the counterweight (8); The traction rope (9) wound out from the traction sheave (2b) has its front end fixedly connected to the bottom of the car (7) and its rear end fixedly connected to the bottom of the counterweight (8). The traction rope (9) on the front side of the traction sheave (2b) is used as the car-side traction rope (9a), and the traction rope (9) on the rear side of the traction sheave (2b) is used as the counterweight-side traction rope (9b); The traction machine (2) drives the traction sheave (2b) through its main shaft; The traction sheave (2b) and the traction machine (2) are hoisted by the traction rope (9) and are arranged at the bottom (1b) of the hoistway and higher than the hoistway floor (1c); At least one end of the traction guide rail (3) is fixedly connected to the hoistway floor (1c); There is a guiding device (4) at the mating part of the traction machine (2) and the traction guide rail (3), so that the traction machine (2) can slide up and down freely along the traction guide rail (3); The guiding device (4) can be self-locked. When the tensions of the car-side traction rope (9a) and the counterweight-side traction rope (9b) change suddenly, resulting in an upward throwing tendency of the traction machine (2), the guiding device (4) can trigger the self-locking function to lock the traction machine (2) from being thrown up; The traction machine under-mounted elevator has two left and right traction sheaves (2b) and two left and right traction ropes (9); The two left and right traction sheaves (2b) are coaxial, driven by the main shaft of the same traction machine (2), and keep synchronous rotation; The left traction rope is wound out from the left traction sheave and its front and rear ends are respectively fixedly connected to the bottom of the car (7) and the bottom of the counterweight (8); The right traction rope is wound out from the right traction sheave and its front and rear ends are respectively fixedly connected to the bottom of the car (7) and the bottom of the counterweight (8).

2. The traction machine under-mounted elevator according to claim 1, characterized in that The pulley block (5) includes a front pulley (5a) and a rear pulley (5b); One end of the compensating rope (6) is connected to the top of the car (7), and after passing upwards around the upper sides of the front pulley (5a) and the rear pulley (5b) in sequence, the other end is connected downwards to the top of the counterweight (8).

3. The traction machine under-mounted elevator according to claim 1, characterized in that In the front-rear direction, the vertical projection of the traction machine (2) is located between the vertical projections of the car (7) and the counterweight (8).

4. The traction machine under-mounted elevator according to claim 3, characterized in that In the front-rear direction, the vertical projection of the traction machine (2) is located at the middle position between the vertical projections of the car (7) and the counterweight (8); The wrap angle of the traction rope (9) wound on the traction sheave (2b) is between 170° and 190°.

5. The traction machine under-mounted elevator according to claim 1, characterized in that The traction machine under-mounted elevator further includes a trailing cable (10); The trailing cable (10) is fixedly connected to the bottom of the car (7).

6. The underhung elevator according to claim 1, characterized in that an adjustable counterweight (2a) is fixedly arranged on the upper part of the traction machine (2).

7. The underhung elevator according to claim 1, characterized in that the traction guide rail (3) is arranged between the left and right traction wheels (2b), or on both sides of the traction machine (2).

8. The underhung elevator according to claim 1, characterized in that a buffer is fixedly installed in the spaced space between the left and right traction wheels (2b).

9. The underhung elevator according to claim 1, characterized in that the symmetry plane of the left and right traction wheels (2b) is the left-right central plane of the car (7).

10. The underhung elevator according to claim 1, characterized in that the traction machine (2) is further fixedly connected with a guide wheel (2c); the guide wheel (2c) is located in front of or behind the traction wheel (2b), and their axes are parallel; the car side hoisting rope (9a) or the counterweight side hoisting rope (9b) also bypasses the lower side of the guide wheel (2c).

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