A multi-adaptable permanent magnet synchronous traction machine drive system

Abstract

The present invention discloses a multi-adaptable permanent magnet synchronous traction machine drive system, comprising: a single-layer main machine base installed on a machine beam in a shaft machine room, a traction sheave fixed to a power output end of a permanent magnet synchronous traction machine, a guide wheel fixed to the main machine base, a car top sheave assembly fixed to the top of a car, a rope end seat fixed to the machine beam, a wire rope assembly connected to a counterweight at one end and passing through the car top sheave assembly and the rope end seat at the other end, the wire rope assembly making two turns around the traction sheave and the guide sheave, a first support seat for mounting the guide sheave provided on the main machine base and a second support seat for mounting the permanent magnet synchronous traction machine being connected via a horizontal cross bar. The two turns of the wire rope increase the wrap angle α of the wire rope on the traction sheave, the strength of the main machine base made of small-sized materials can meet the design requirements, the material cost of the main machine base is saved, and the structure is both convenient for on-site installation.

Description

Technical Field

[0001] The invention belongs to the technical field of machine room elevators and relates to a traction drive system of an elevator. Background Art

[0002] The layout of the original drive system of the machine room elevator is as follows Figure 1 As shown in the figure, the wire rope 5 connects the car 3 and the counterweight 12, and the car 3 is lifted (or lowered) by the tension T1 and T2 between the two. The reasonable range of T1 and T2 is determined by the calculation formula of the traction force in Appendix M of the regulation GB7588-2003. The traction force plays a vital role in the entire elevator system.

[0003] The formula for calculating the drag force is as follows:

[0004] Used for car 3 loading and emergency braking conditions;

[0005] For car 3 detention condition (counterweight presses on the buffer, traction force rotates upward)

[0006] Where: f is the equivalent friction coefficient; a is the wrap angle of the wire rope 5 on the sheave, in radians; T1 and T2 are the tensions on the wire rope 5 hanging on both sides of the pulley.

[0007] The calculation formula of the equivalent friction coefficient f based on the rope groove angle of the main engine traction sheave 1 is:

[0008]

[0009] According to the above formula, in order to make the traction force meet the requirements for normal operation of the elevator, under the premise of limited hoistway size, there are generally the following methods:

[0010] 1. By increasing the installation height of the traction main unit, that is, increasing the relative height H between the main unit traction sheave 1 and the guide sheave 2, the wrap angle α of the wire rope 5 on the main unit traction sheave 1 is increased. In order to increase the relative height H, the traction system of this structure usually uses large-sized materials, resulting in material waste. The use of large-sized materials makes the entire system heavy and inconvenient to install. Moreover, as the size of the car 3 changes continuously, different system structures need to be arranged according to different sizes, resulting in a low universality rate.

[0011] 2. Add counterweights to the sides of car 3 to increase the overall mass of the car 3 system to meet traction calculation requirements. Because the dimensions of car 3 constantly change along the shaft, the weight of car 3 itself also changes constantly. When configuring the number of counterweights, avoid wasting materials. Typically, calculations are required for each elevator, a tedious and time-consuming process. Furthermore, the placement of the counterweights requires the design of mounting brackets (or beams), which limits the design of car 3 and prevents optimal design.

[0012] 3. Changing the rope groove angles β and γ on the main engine traction sheave 1 to meet the traction force calculation requirements. To meet the requirements of elevator systems with different loads and speeds, multiple rope groove angles must be calculated, sometimes even at extreme angles. This causes significant wear on the wire rope 5, seriously shortening its service life. Furthermore, the low universality rate hinders standardized design.

[0013] 4. The above three methods are mixed together, which is more cumbersome and time-consuming.

[0014] Therefore, it is urgent to propose a traction machine drive system that has a simple structure, is easy to install, has a lower cost and a high universality rate while meeting the elevator operating conditions and safety strength. Summary of the Invention

[0015] The technical problem to be solved by the present invention is to provide a traction machine drive system with a simple structure, convenient installation, lower cost and high universality.

[0016] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0017] A multi-adaptable permanent magnet synchronous traction machine drive system, comprising:

[0018] The single-layer main engine base is installed on the machine beam of the shaft machine room.

[0019] The permanent magnet synchronous traction machine is fixed on the main engine base.

[0020] The traction wheel is fixed to the power output end of the permanent magnet synchronous traction machine.

[0021] The guide wheel is fixed on the main engine base.

[0022] The car top sheave assembly is fixed on the top of the car.

[0023] The rope head seat is fixed on the shelf beam.

[0024] One end is connected to the counterweight, and the other end is passed around the car top rope pulley assembly and connected to the rope head seat.

[0025] The wire rope assembly wraps around the traction wheel and the guide wheel twice, the center height of the guide wheel is higher than or equal to the center height of the traction wheel, and the first support seat for installing the guide wheel provided on the main machine seat is connected to the second support seat for installing the permanent magnet synchronous traction machine through a horizontal cross bar.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The wire rope wraps around the traction sheave and guide sheave twice, increasing the wrap angle α of the wire rope on the traction sheave. This eliminates the need to increase the relative height between the traction sheave and the guide sheave. The strength of the mainframe made of small-sized materials can meet the design requirements, saving the material cost of the mainframe. The structure is also more convenient for on-site installation.

[0028] 2. The car top wheel is fixed in the middle of the two sub-beams of the upper beam, which reduces the space occupied and requires less space above the shaft. It is suitable for elevators with a car bottom height of the top floor.

[0029] 3. The increase in the wrap angle α of the wire rope improves the traction force of the traction machine. Under the premise that the traction force requirement is relatively large, the installation height of the guide wheel can be increased so that the center of the guide wheel is higher than the center of the traction wheel, and the wire rope passing around the traction wheel is inclined and upwardly wound around the guide wheel. Under the premise that the traction force requirement is relatively small, the installation height of the guide wheel can be lowered so that the center of the guide wheel is equal to the center of the traction wheel, and the wire rope passing around the traction wheel is horizontally wound around the guide wheel. It can be seen that different traction forces can be obtained by adjusting the height of the guide wheel without adjusting the installation height of the traction machine. In addition, the guide wheel is installed on the shelf beam, and the installation height adjustment is relatively convenient;

[0030] 4. The relative height between the guide wheel and the traction wheel is reduced. The support seat of the guide wheel needs to bear the horizontal tension between the guide wheel and the traction wheel. A cross bar is added between the support seats of the guide wheel and the traction wheel to offset the horizontal tension. The support seat of the guide wheel can be selected with a smaller specification and no special reinforcement design is required;

[0031] 5.e fa The value becomes larger, and there is no need to increase the overall mass of the car system to meet the traction force calculation formula, which reduces the weight of the car side, making the car further lightweight. There is no need to design an additional mounting beam for fixing the counterweight. The car structure is not affected by the mounting beam, and the car structure can be optimized more reasonably.

[0032] 6. The wrap angle α of the wire rope on the traction sheave becomes larger, which increases the friction between the wire rope and the rope groove. Under the premise that the traction force meets the normal use of the elevator, the rope groove angle on the main traction sheave can be designed uniformly, and β can be designed to be close to 0 degrees. The rope groove is designed to be close to 0 degrees, which minimizes the wear on the wire rope and increases the service life of the wire rope;

[0033] 7. When the width or depth of the car changes, it is only necessary to adjust the layout position of the rope head seat on the machine beam without changing the layout of the entire traction system. This makes this traction system suitable for cars and shafts of various specifications and has a high degree of universality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments.

[0035] Figure 1 A schematic diagram of the arrangement of a drive system of an elevator with a machine room in the prior art;

[0036] Figure 2 Schematic diagram of the arrangement of the drive system of the machine room elevator in the embodiment (first state);

[0037] Figure 3 Schematic diagram of the arrangement of the drive system of the machine room elevator in the embodiment (second state);

[0038] Figure 4 for Figure 2 Schematic diagram of the traction sheave angle in FIG;

[0039] Figure 5 for Figure 3 Schematic diagram of the traction sheave angle in FIG;

[0040] Figure 6 It is a side view of the installation structure of the traction wheel and the guide wheel;

[0041] Figure 7 This is a top view of the installation structure of the traction wheel and guide wheel. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] In the present invention, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, "connection" can mean fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two elements, or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one such feature. Furthermore, the technical solutions of various embodiments may be combined with each other, but only on the basis that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions contradicts or cannot be implemented, it shall be deemed that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this disclosure.

[0046] Reference Figure 2 A traction drive system includes a single-layer main engine base 4 installed on the shelf beam of the shaft machine room, a permanent magnet synchronous traction machine 6 fixed on the main engine base 4, a traction sheave 1 fixed to the power output end of the permanent magnet synchronous traction machine 6, a guide wheel 2 fixed on the main engine base 4, a car top rope pulley assembly 7 fixed to the top of the car 3, a rope end seat 8 fixed on the shelf beam, a wire rope assembly with one end connected to the counterweight and the other end passing around the car top rope pulley assembly 7 and connected to the rope end seat 8, and the wire rope assembly wraps around the traction sheave 1 and the guide wheel 2 twice. The way the wire rope 5 wraps around twice increases the wrap angle α of the wire rope 5 on the traction sheave 1, increases the friction between the wire rope 5 and the traction sheave 1, and increases the traction force of the system. Under the existing traction force requirements, the strength of the single-layer main engine base 4 made of smaller-sized materials can meet the traction force requirements. The car top wheel is fixed in the middle position of the two branch beams of the upper beam, which reduces the space occupied and requires less space above the shaft. It is suitable for elevators with a car bottom layer height.

[0047] Figure 2 The center height of the guide wheel 2 is higher than the center height of the traction wheel 1. The wrap angle of the traction wheel 1 is as follows: Figure 5 As shown, the wrap angle of the wire rope 5 on the traction wheel 1 is α1+(180°-α2), α1=180°. The guide wheel 2 can also be moved upward so that its center height is higher than the center height of the traction wheel 1 (see Figure 3 ), the wrap angle of the traction sheave 1 is as follows Figure 4 As shown in FIG, the wrap angle of the steel wire rope 5 on the traction wheel 1 is α1+(180°-α2), α1=180°. Figure 4 and 5 It can be seen that when the center height of the guide wheel 2 is higher than the center height of the traction wheel 1, the wrap angle α of the wire rope 5 on the traction wheel 1 is larger, and the obtained traction force is larger. The guide wheel 2 is moved to the top of the shelf beam for installation. The installation height of the guide wheel 2 is not affected by the position of the shelf beam. The arrangement scheme of the guide wheel 2 adjusting up and down meets the elevator's requirements for different wrap angles α.

[0048] The wrap angle α of the traction sheave 1 becomes larger, e faThe value will also become larger, and there is no need to increase the overall mass of the car 3 system to meet the traction force calculation formula. The weight of the car 3 side is reduced, making the car 3 further lightweight. There is no need to additionally design a mounting beam for fixing the counterweight. The structure of the car 3 is not affected by the mounting beam, and the structure of the car 3 can be optimized more reasonably.

[0049] The bottom plane of the base plate of the rope end seat 8 is aligned with the horizontal plane of the hoist beam, and the base plate and the hoist beam are fixedly connected by bolts. When the width or depth of the car 3 changes, only the position of the rope end seat 8 on the hoist beam needs to be adjusted, without changing the layout of the entire traction system. This makes the traction system suitable for a variety of car 3 specifications and hoistway types, and has a high degree of universality.

[0050] The first support base 10 for mounting the guide wheel 2 provided on the main frame 4 is connected to the second support base 11 for mounting the permanent magnet synchronous traction machine 6 by a horizontal crosspiece 9. Preferably, there are two crosspieces 9, one on each side of the first support base 10 and the other on both sides of the second support base 11. The relative height between the guide wheel 2 and the traction wheel 1 is reduced, and the support base of the guide wheel 2 needs to withstand the horizontal tension between the guide wheel 2 and the traction wheel 1. The crosspiece 9 is added between the support bases of the guide wheel 2 and the traction wheel 1 to offset the horizontal tension. The support base of the guide wheel 2 can be selected to be smaller in size, without the need for special reinforcement design.

[0051] Preferably, the crosspiece 9 is fixedly connected to the first support seat 10 and the second support seat 11 by bolts, and the flexible connection method can avoid deformation of the support seat and the crosspiece 9.

[0052] Preferably, a Z-shaped bracket 13 is fixed to the outside of the second support seat 11, and the end of the crosspiece 9 is fixedly connected to the middle of the Z-shaped bracket by bolts. The crosspiece 9 is fixedly connected to the first support seat 10 by bolts, and the Z-shaped bracket is connected to the second support seat 11 by bolts. The Z-shaped bracket and the second support seat 11 are connected at two points, and the crosspiece 9 and the first support seat 10 are connected at a single point. A combination of the crosspiece 9 and the C-shaped bracket is used between the first support seat 10 and the second support seat 11, so that a three-point flexible connection is formed between the two support seats, thereby improving the support strength of the crosspiece 9 on the first support seat 10.

[0053] The wrap angle α of the wire rope 5 on the traction sheave 1 becomes larger, which increases the friction between the wire rope 5 and the rope groove. Under the premise that the traction force meets the normal use of the elevator, the rope groove angle on the main traction sheave 1 can be designed uniformly. The lower cut angle β of the rope groove of the traction sheave 1 is designed to be close to 0°. The lower cut groove of the rope groove is designed to be close to 0 degrees, which minimizes the wear of the wire rope 5 and increases the service life of the wire rope 5.

[0054] The car top sheave assembly 7 is fixed in the middle of the car top beam, reducing space usage, lowering the hoistway ceiling, and expanding the safe haven space on the car top, meeting higher safety standards. The side brackets of the car top sheave assembly 7 are bolted to the car top beam. Designed as a separate system, the car top sheave assembly 7 is fixed to the beam, unaffected by the upper beam structure and can be easily removed and installed during maintenance.

[0055] The multi-adaptable permanent magnet synchronous traction machine 6 drive system in this embodiment adopts a unique arrangement of cross bars 9, which solves the stress situation in the centerline direction of the main engine traction wheel 1 and the guide wheel 2 under the rewinding mode. When designing the guide wheel 2 seat, there is no need to consider or only a small amount of consideration is given to the stress situation in the centerline direction of the two wheels caused by the rewinding mode of the wire rope 5. Therefore, smaller materials can be used to make the guide wheel 2 support seat, reducing the production cost. The spatial arrangement of the traction wheel 1 and the guide wheel 2 adopts an arrangement in which the centerline of the guide wheel 2 is at the same height as the centerline of the traction wheel 1 and the centerline of the guide wheel 2 is higher than the centerline of the traction machine wheel. This satisfies the needs of various sizes of cars 3, and a set of traction systems is applicable to a variety of different sizes of cars 3 at the same time, with a high degree of commonality, realizing the multi-adaptability of a drive structure.

[0056] Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not limited to the embodiments shown herein, but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A multi-adaptable permanent magnet synchronous traction machine drive system, characterized in that: include: The single-layer main engine base is installed on the machine beam of the shaft machine room. The permanent magnet synchronous traction machine is fixed on the main engine base. The traction wheel is fixed to the power output end of the permanent magnet synchronous traction machine. The guide wheel is fixed on the main engine base. The car top sheave assembly is fixed on the top of the car. The rope head seat is fixed on the shelf beam. One end is connected to the counterweight, and the other end is passed around the car top rope pulley assembly and connected to the rope head seat. The wire rope assembly wraps around the traction wheel and the guide wheel twice, the center height of the guide wheel is higher than or equal to the center height of the traction wheel, and the first support seat for installing the guide wheel provided on the main body seat and the second support seat for installing the permanent magnet synchronous traction machine are connected by a horizontal cross bar. There are two cross bars, which are respectively provided on both sides of the first support seat and the second support seat. The cross bars are fixed to the first support seat and the second support seat by bolts.

2. The multi-adaptable permanent magnet synchronous traction machine drive system according to claim 1, characterized in that: A Z-shaped bracket is provided on the outer side of the second support seat, and the end of the cross piece is fixedly connected to the middle part of the Z-shaped bracket by bolts.

3. The multi-adaptable permanent magnet synchronous traction machine drive system according to claim 2, characterized in that: The crossbar is fixedly connected to the first support seat by bolts, and the Z-shaped bracket is connected to the second support seat by bolts.

4. The multi-adaptable permanent magnet synchronous traction machine drive system according to claim 1, characterized in that: The bottom plane of the base plate of the rope end seat is in contact with the horizontal plane of the shelf beam, and the base plate and the shelf beam are fixedly connected by bolts.

5. The multi-adaptable permanent magnet synchronous traction machine drive system according to claim 1, characterized in that: The lower cut angle β of the rope groove of the traction sheave is close to 0 degrees.

6. The multi-adaptable permanent magnet synchronous traction machine drive system according to claim 1, characterized in that: The car top rope pulley assembly is fixed at the middle position of the two branch beams of the car top upper beam.

7. The multi-adaptable permanent magnet synchronous traction machine drive system according to claim 6, characterized in that: The side bracket of the car top rope pulley assembly is fixedly connected to the car top upper beam by bolts.

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