Elevator hoist rope head tension automatic balancing method and device

Abstract

The invention relates to the technical field of elevator equipment, in particular to an elevator hoist rope head tension automatic balancing method and device.A plurality of hoist rope heads are fixed in a tension automatic balancing device, and tension of the hoist rope heads is balanced through the tension automatic balancing device; the tension automatic balancing device comprises a rope head supporting hinge seat, a multi-stage balancing beam and a rope head device base from top to bottom; each balance beam comprises three balance fulcrums; the rope head supporting hinge seat is fixedly connected with a traction rope head; the balance supporting points on the two sides of the first-stage balance beam are hinged to the two rope head supporting hinge seats respectively, and the balance supporting point in the middle of the rear-stage balance beam is hinged to the balance supporting point on one side of the front-stage balance beam. The multi-stage balance beams and the balance fulcrums are used for carrying out tension balance on the rope heads of the hoisting ropes, so that the tension difference between the hoisting ropes in the using process of an elevator is controlled within an acceptable range in real time, and the service life of the hoisting ropes and the service life of the hoisting wheel are prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator equipment, and in particular to a method and a device for automatically balancing the tension of an elevator traction rope end. Background Art

[0002] The driving mechanism of a traction-driven elevator is the traction machine, which drives the traction ropes through friction between the traction sheave's rope grooves and the wire ropes. The traction sheave has multiple rope grooves, each with a traction rope. The suspended loads, including the elevator car, counterweight, and load, are shared by all the traction ropes. Each wire rope bears its own load independently, and the force applied to each rope is determined after installation and commissioning. Traditional traction rope end devices can only adjust the tension of each rope individually and do not balance the tension between the ropes. This cannot ensure balanced tension across the ropes during use. However, GB / T7588.1, "Safety Code for the Manufacture and Installation of Elevators - Part 1 - Passenger and Load Lifts," stipulates in Section 5.5.5.1 that an automatic adjustment device should be installed at at least one end of the suspension wire rope or chain to balance the tension between the ropes or chains. Therefore, traditional rope end devices do not meet this standard.

[0003] The hazards of uneven tension between the traction ropes include: (1) Uneven tension of the traction ropes will cause uneven wear of the rope grooves of the traction wheel, reducing the service life of the traction wheel and causing waste. (2) Uneven tension of the traction ropes will cause accelerated wear of the traction rope, reducing the service life of the traction rope and causing waste. (3) The cost of replacing the traction wheel or traction rope should not be underestimated, because the traction rope is replaced as a whole, rather than replacing one of the traction ropes. For example: a 100m lifting height, a 2:1 traction ratio, and an elevator with 6 traction ropes require about 2400m of steel wire rope. Replacing the traction wheel or traction rope is time-consuming and labor-intensive, and affects passengers' use of the elevator. Therefore, ensuring balanced tension between the traction ropes is a key factor in increasing the service life of the traction wheel or traction rope, but the existing traction rope head device does not have the function of tension balancing. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a method and device for automatically balancing the tension of an elevator traction rope end, so as to solve the problems in the background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides an automatic balancing method for the tension of an elevator traction rope end, comprising the steps of:

[0007] Fixing the ends of the multiple traction ropes in an automatic tension balancing device, and using the automatic tension balancing device to balance the tension of the multiple traction rope ends;

[0008] Among them, the automatic tension balancing device includes a rope end support hinge seat, a multi-stage balance beam and a rope end device base from top to bottom; each balance beam includes three balance fulcrums; the rope end support hinge seat is fixedly connected to the rope end of the traction rope; the balance fulcrums on both sides of the first-stage balance beam are respectively hinged to the two rope end support hinge seats, the balance fulcrum in the middle position of the rear-stage balance beam is hinged to the balance fulcrum on one side of the front-stage balance beam, and the last-stage balance beam is hinged to the rope end device base; the multi-stage balance beam and the rope end device base are both provided with through holes, and the traction rope is passed through the through holes of the multi-stage balance beam and the through holes of the rope end device base.

[0009] In one embodiment of the present application, the automatic tension balancing device includes two rows of rope end support hinged seats; the multi-stage balance beam includes a longitudinal balance beam and a transverse balance beam, the longitudinal balance beam is respectively provided with three balance fulcrums on the front and rear sides, and the transverse balance beam is respectively provided with three balance fulcrums on the left and right sides; and the side beams used to connect the longitudinal balance beam and the transverse balance beam are each provided with balance fulcrums on both sides and the front and rear sides.

[0010] The balancing fulcrums on the front and rear sides of the side beam are respectively hinged to the balancing fulcrums at the middle position of the front and rear sides of the upper longitudinal balance beam, and the balancing fulcrums on the left and right sides of the side beam are respectively hinged to the balancing fulcrums on one of the left and right sides of the lower transverse balance beam.

[0011] In one embodiment of the present application, the balance fulcrum is a circular hole or a cylinder, and different balance beams are hinged by inserting the cylinder into the circular hole.

[0012] In one embodiment of the present application, gaps are provided between adjacent balance beams and between the last-stage balance beam and the base of the rope head device to provide a rotation space for the balance beam.

[0013] In one embodiment of the present application, a tension adjustment mechanism is further included, wherein the tension adjustment mechanism includes a tension adjustment nut located above the rope end support hinge seat, and a compression spring located between the tension adjustment nut and the rope end support hinge seat;

[0014] The tension adjustment nut is matched with a thread arranged on the traction rope, and the compression spring is sleeved on the traction rope.

[0015] In one embodiment of the present application, the multi-stage balance beam includes three-stage longitudinal balance beams, one-stage side beam and one-stage transverse balance beam.

[0016] In one embodiment of the present application, a bolt preload sensor for monitoring the rope tension is provided between the rope end hinged support and the compression spring.

[0017] In one embodiment of the present application, it further includes:

[0018] An automatic tension balancing device is installed on both the counterweight side and the car side of the elevator, and the measured tension p of each rope end on the counterweight side is obtained. i , and obtain the measured tension q of each rope end on the car side i , where i is the rope head number;

[0019] When the measured tension q of each rope end on the car side i When the overload judgment condition is met, the overload protection is triggered, wherein the mathematical expression of the overload judgment condition is:

[0020]

[0021] Where n is the number of rope ends, q0 is the theoretical tension of each rope end on the car side at rated load;

[0022] When the measured tension q of each rope end on the car side i And the measured tension p of each rope end on the counterweight side i When the tension unevenness judgment condition is met, the tension unevenness protection is triggered, where the tension unevenness judgment condition is one of the following mathematical expressions:

[0023]

[0024] When the measured tension q of each rope end on the car side i And the measured tension p of each rope end on the counterweight side i When the rope breaking judgment condition is met, the rope breaking protection is triggered, wherein the rope breaking judgment condition is or

[0025] In one embodiment of the present application, it further includes:

[0026] When the overload protection is triggered, the elevator stops and resumes operation when the elevator load returns to the rated load;

[0027] When the uneven tension protection is triggered, the elevator stops and resumes operation when the tension of multiple rope ends is adjusted to balance;

[0028] When the broken rope protection is triggered, the elevator stops and resumes operation when all the traction ropes are replaced and the tension at the rope ends is balanced after the traction ropes are replaced.

[0029] The present application also provides an automatic balancing device for the tension of the end of an elevator traction rope, comprising a rope end support hinge seat, a multi-stage balance beam and a rope end device base from top to bottom; each balance beam comprises three balance fulcrums; the rope end support hinge seat is fixedly connected to the rope end of the traction rope; the balance fulcrums on both sides of the first-stage balance beam are respectively hinged to the two rope end support hinge seats, the balance fulcrum in the middle position of the rear-stage balance beam is hinged to the balance fulcrum on one side of the front-stage balance beam, and the last-stage balance beam is hinged to the rope end device base; the multi-stage balance beam and the rope end device base are both provided with through holes, and the traction rope is passed through the through holes of the multi-stage balance beam and the through holes of the rope end device base.

[0030] The beneficial effects of the present invention are as follows: the present invention provides an elevator traction rope end tension automatic balancing method and device, which fixes multiple traction rope ends in a tension automatic balancing device and uses the tension automatic balancing device to balance the tension of the multiple traction rope ends; the tension automatic balancing device includes a rope end support hinge seat, a multi-stage balance beam and a rope end device base from top to bottom; each balance beam includes three balance fulcrums; the rope end support hinge seat is fixedly connected to the traction rope end; the balance fulcrums on both sides of the first-stage balance beam are respectively hinged to the two rope end support hinge seats, the balance fulcrum in the middle position of the rear-stage balance beam is hinged to the balance fulcrum on one side of the front-stage balance beam, and the last-stage balance beam is hinged to the rope end device base. The present application utilizes multi-stage balance beams and balance fulcrums to balance the tension of multiple traction rope ends, so that the tension difference between each traction rope is controlled in real time within an acceptable range during the use of the elevator, which is beneficial to improving the service life of the traction rope and the traction wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0032] Figure 1 This is a structural diagram of an automatic balancing device for the tension of an elevator traction rope end shown in one embodiment of the present application;

[0033] Figure 2 This is an exploded schematic diagram of an automatic balancing device for the tension of an elevator traction rope end in one embodiment of the present application;

[0034] Figure 3 Schematic diagram of the balancing principle of a balance beam in one embodiment of the present application;

[0035] Figure 4 A schematic diagram of the balancing principle of a multi-stage balancing beam in one embodiment of the present application;

[0036] Figure 5 This is a schematic diagram of the balance beam configuration structure when the number of traction ropes in this application is 4;

[0037] Figure 6This is a schematic diagram of the balance beam configuration structure when the number of traction ropes in this application is 5;

[0038] Figure 7 This is a schematic diagram of the balance beam configuration structure when the number of traction ropes in this application is 6;

[0039] Figure 8 This is a schematic diagram of the balance beam configuration structure when the number of traction ropes in this application is 7;

[0040] Figure 9 This is a schematic diagram of the balance beam configuration structure when the number of traction ropes in this application is 8;

[0041] Figure 10 This is a schematic diagram of the balance beam configuration structure when the number of traction ropes in this application is 9;

[0042] Figure 11 This is a schematic diagram of the balance beam configuration structure when the number of traction ropes in this application is 10;

[0043] Figure 12 This is a schematic diagram of the balance beam configuration structure when the number of traction ropes in this application is 11;

[0044] Figure 13 This is a schematic diagram of the balance beam configuration structure when the number of traction ropes in this application is 12;

[0045] Figure 14 This is a schematic diagram of the balance beam configuration structure when the number of traction ropes in this application is 13;

[0046] Figure 15 This is a schematic diagram of the balance beam configuration structure when the number of traction ropes in this application is 14;

[0047] Figure 16 This is a schematic diagram of the balance beam configuration structure when the number of traction ropes in this application is 15;

[0048] Figure 17 This is a schematic diagram of the balance beam configuration structure when the number of traction ropes in this application is 16;

[0049] 1-Rope end support hinge seat;

[0050] 2-balance beam, 21-longitudinal balance beam, 22-side beam, 23-transverse balance beam, 24-balance fulcrum;

[0051] 3- Rope head device base;

[0052] 4-Tension adjustment screw;

[0053] 5-Compression spring. DETAILED DESCRIPTION

[0054] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0055] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. Therefore, the drawings only show the layers related to the present invention and are not drawn according to the number, shape and size of the layers in actual implementation. In actual implementation, the type, quantity and proportion of each layer can be changed arbitrarily, and the layer layout type may also be more complicated.

[0056] In the following description, numerous details are set forth to provide a more thorough explanation of the embodiments of the present invention; however, it is apparent to one skilled in the art that the embodiments of the present invention may be practiced without these specific details.

[0057] Figure 1 FIG. 1 is a structural diagram of an automatic balancing device for the tension of an elevator traction rope end shown in one embodiment of the present application. Figure 1 As shown, a method for automatically balancing the tension of an elevator traction rope end based on an automatic tension balancing device in this embodiment may include:

[0058] Fixing the ends of the multiple traction ropes in an automatic tension balancing device, and using the automatic tension balancing device to balance the tension of the multiple traction rope ends;

[0059] Among them, the automatic tension balancing device includes a rope end support hinge seat 1, a multi-stage balance beam 2 and a rope end device base 3 from top to bottom; each balance beam 2 includes three balance fulcrums 24; the rope end support hinge seat 1 is fixedly connected to the rope end of the traction rope; the balance fulcrums 24 on both sides of the first-stage balance beam 2 are respectively hinged to the two rope end support hinge seats 1, and the balance fulcrum 24 in the middle position of the rear-stage balance beam 2 is hinged to the balance fulcrum 24 on one side of the previous-stage balance beam 2, and the last-stage balance beam 2 is hinged to the rope end device base 3; the multi-stage balance beam 2 and the rope end device base 3 are both provided with through holes, and the traction rope is passed through the through holes of the multi-stage balance beam 2 and the through holes of the rope end device base 3.

[0060] Figure 2 FIG. 1 is an exploded schematic diagram of an automatic balancing device for the tension of an elevator traction rope end according to an embodiment of the present invention. Figure 2As shown, the automatic tension balancing device includes two rows of rope end support hinged seats 1; the multi-stage balancing beam 2 includes a longitudinal balancing beam 212 and a transverse balancing beam 232. The longitudinal balancing beam 212 is provided with three balancing fulcrums 24 on the front and rear sides, and the transverse balancing beam 232 is provided with three balancing fulcrums 24 on the left and right sides. The side beam 22 used to connect the longitudinal balancing beam 212 and the transverse balancing beam 232 is provided with balancing fulcrums 24 on both sides and the front and rear sides.

[0061] Specifically, the multi-stage balance beam 2 includes three longitudinal balance beams 21, one side beam 22, and one transverse balance beam 23. The hinge axes of the longitudinal balance beam 21 and the transverse balance beam 23 are perpendicular, and are used to automatically balance the longitudinal and transverse unbalanced stresses respectively.

[0062] The balancing fulcrums 24 on the front and rear sides of the side beam 22 are respectively hinged to the balancing fulcrums 24 at the middle position of the front and rear sides of the upper longitudinal balance beam 21, and the balancing fulcrums 24 on the left and right sides of the side beam 22 are respectively hinged to the balancing fulcrums 24 on one of the left and right sides of the lower transverse balance beam 232.

[0063] In this embodiment, the balancing fulcrum 24 is a circular hole or a cylinder, and the different balancing beams 2 are hinged by inserting the cylinder into the circular hole. The balancing fulcrum 24 at the middle position is a circular hole, and the balancing fulcrum 24 at the edge position is a cylinder, thereby achieving a hierarchical connection.

[0064] Figure 3 Schematic diagram of the balancing principle of the balance beam in one embodiment of the present application. Figure 4 FIG. 1 is a schematic diagram of the balancing principle of a multi-stage balancing beam in one embodiment of the present application. Figure 3-Figure 4 As shown, the balance beam bears two loads F1 and F2 and a supporting force F. The balance beam can rotate around the fulcrum. The three forces on the balance beam are plane parallel force systems in any state.

[0065] The equilibrium conditions for an equally divided balance beam are: F1 = F2, and F = F1 + F2. When F1 ≠ F2, the balance beam is disrupted and rotates about its fulcrum. As shown in the figure, if F1 > F2, the beam will rotate counterclockwise. During this rotation, F1 will gradually relax and decrease, while F2 will gradually tighten and increase, until F1 = F2 again, maintaining equilibrium. Therefore, the beam automatically balances the loads at both ends. The same applies if F2 > F1.

[0066] The equilibrium condition of the unequally divided balanced beam is: F = F1 + F2;

[0067] The size of F1 and F2 is inversely proportional to the distance L1 and L2 from the point of action to the middle hinge point: F1 / F2=L2 / L1.

[0068] Depend on Figure 4It can be seen that in this application, the number and structure of the multi-level balance beams are determined based on the number of traction ropes. Figure 5-Figure 17 This is a diagram of the balance beam configuration structure when the number of traction ropes ranges from 4 to 16. Please refer to Figure 5-Figure 17 The following table shows the configuration of the traction quantity (P) and balance beam configuration of the balance beam according to the number of traction ropes:

[0069] Traction quantity (P) and balance beam configuration table

[0070]

[0071]

[0072] In addition, gaps are provided between adjacent balance beams and between the last-stage balance beam and the base of the rope head device to provide space for the balance beam to rotate. The gaps can ensure that each balance beam can rotate freely to achieve automatic load balancing; the size of the gaps can also limit the rotation angle from being too large, so as to ensure that when the balance is broken by an unexpected situation (for example, one of the traction ropes breaks or stretches, causing the load to disappear or decrease), the balance beam can still support the load transmitted by the remaining traction ropes. As long as there is tension in one traction rope, there will be no dangerous situation where the car or counterweight suspension fails and falls. In order to keep the balance beam in an automatic balancing state in real time, it is only necessary to adjust the loads at both ends of the balance beam to control the balance beam within the rotation range so that the bottom of the balance beam does not contact other balance beams, the lateral balance beam or the base. It does not need to be kept in a horizontal state in real time.

[0073] The traction system also includes a tension adjustment mechanism, comprising a tension adjustment nut 4 located above the rope end support hinge and a compression spring 5 located between the nut and the hinge. The nut 4 engages with threads on the traction rope, and the compression spring 5 is sleeved onto the traction rope. When the nut 4 is rotated, further compressing the spring, the spring's force to return to its original shape increases, increasing its pull on the rope and thereby increasing the rope's tension. Conversely, loosening the nut and causing the spring to slightly rebound reduces the spring's pull on the rope, lowering the rope's tension.

[0074] In one embodiment of the present application, a bolt preload sensor for monitoring the rope tension is provided between the rope end hinged support and the compression spring. Based on the bolt preload sensor, the present application can also implement a variety of protection mechanisms, including:

[0075] (1) Assume that the number of traction ropes in the elevator traction system is n, and an automatic tension balancing device is installed on both the counterweight side and the car side of the elevator, and the measured tension p of each rope end on the counterweight side is obtained. i , and obtain the measured tension q of each rope end on the car sidei , where i is the rope head number;

[0076] (2) When the measured tension q of each rope end on the car side i When the overload judgment condition is met, the overload protection is triggered. The mathematical expression of the overload judgment condition is:

[0077]

[0078] Where n is the number of rope ends, q0 is the theoretical tension of each rope end on the car side at rated load;

[0079] (3) When the measured tension q of each rope end on the car side i And the measured tension p of each rope end on the counterweight side i When the tension unevenness judgment condition is met, the tension unevenness protection is triggered, where the tension unevenness judgment condition is one of the following mathematical expressions:

[0080]

[0081] (4) When the measured tension q of each rope end on the car side i And the measured tension p of each rope end on the counterweight side i When the rope breaking judgment condition is met, the rope breaking protection is triggered. or

[0082] (5) When the overload protection is triggered, the elevator stops and resumes operation when the elevator load returns to the rated load;

[0083] (6) When the uneven tension protection is triggered, the elevator stops and resumes operation when the tension of multiple rope ends is adjusted to balance;

[0084] (7) When the broken rope protection is triggered, the elevator stops and resumes operation when all the traction ropes are replaced and the tension at the rope ends is balanced after the traction ropes are replaced.

[0085] If any one or more of the broken rope protection, uneven tension protection, and overload protection is triggered, a stop command will be issued, causing the elevator to automatically stop immediately. If the overload protection is triggered, the elevator will automatically resume operation after the load is reduced to within the rated load. If the uneven tension protection is triggered, the rope end device must be adjusted to the automatic balancing state to achieve tension balance and resume operation. If the broken rope protection is triggered, all traction ropes must be replaced. After replacement, the rope end device must be adjusted to the automatic balancing state to achieve tension balance before operation can be resumed.

[0086] The present application also provides an automatic balancing device for the tension of the end of an elevator traction rope, comprising a rope end support hinge seat, a multi-stage balance beam and a rope end device base from top to bottom; each balance beam comprises three balance fulcrums; the rope end support hinge seat is fixedly connected to the rope end of the traction rope; the balance fulcrums on both sides of the first-stage balance beam are respectively hinged to the two rope end support hinge seats, the balance fulcrum in the middle position of the rear-stage balance beam is hinged to the balance fulcrum on one side of the front-stage balance beam, and the last-stage balance beam is hinged to the rope end device base; the multi-stage balance beam and the rope end device base are both provided with through holes, and the traction rope is passed through the through holes of the multi-stage balance beam and the through holes of the rope end device base.

[0087] The elevator traction rope end tension automatic balancing device in this application has the following characteristics:

[0088] 1. It can automatically balance the tension between the traction ropes, so that the tension difference between the traction ropes can be controlled in real time within an acceptable range during the use of the elevator, which is beneficial to prolong the service life of the traction ropes and traction sheaves.

[0089] 2. The structure is simple, the cost is low, the balance principle is intuitive, and the balance adjustment is relatively easy. As long as the bottom of each balance beam does not contact other balance beams, side beams or bases, the tension can be automatically balanced.

[0090] 3. It can provide conditions for setting rope break protection, uneven tension protection and overload protection for elevators.

[0091] 4. After the tension automatic balancing rope head device model is established, in actual application, according to the elevator parameters: such as the maximum tension of the traction rope, the number of traction ropes, the traction rope spacing, the diameter of the rope head adjustment screw, etc., the structural dimensions are modified and the strength is verified, and it can be directly applied without changing the structure.

[0092] 5. The balancing effect of the tension automatic balancing rope head device can be verified in real time by setting a bolt preload sensor.

[0093] 6. You can adjust one rope end at will to break the balance state and verify the effectiveness of the uneven tension protection.

[0094] 7. You can adjust one end of the rope to loosen it and verify the effectiveness of the rope break protection.

[0095] 8. Load tests can be carried out to verify the effectiveness and accuracy of overload protection.

[0096] 9. Theoretically, when the tension-balancing rope head device is in the automatic balancing state, the tension of each traction rope should be equal. However, due to the inevitable machining errors of the balancing device and the rotational resistance at the hinges between the balancing beams, these factors will inevitably lead to balancing errors. Therefore, it is difficult to ensure that the tension of each traction rope is absolutely equal. However, it is easy to control the balancing error to an acceptable level by improving the machining accuracy and the lubrication conditions of the hinges between the balancing beams.

[0097] In the above embodiments, although the present invention has been described in conjunction with specific embodiments of the present invention, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art based on the foregoing description. The embodiments of the present invention are intended to cover all such replacements, modifications and variations that fall within the broad scope of the appended claims.

[0098] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A method for automatically balancing the tension of an elevator traction rope end, characterized in that: include: Fixing the ends of the multiple traction ropes in an automatic tension balancing device, and using the automatic tension balancing device to balance the tension of the multiple traction rope ends; The automatic tension balancing device comprises a rope end support hinge seat (1), a multi-stage balance beam (2) and a rope end device base from top to bottom; each balance beam (2) comprises three balance fulcrums (24); the rope end support hinge seat (1) is fixedly connected to the rope end of the traction rope; the balance fulcrums (24) on both sides of the first-stage balance beam (2) are respectively hinged to the two rope end support hinge seats (1), the balance fulcrum (24) at the middle position of the rear-stage balance beam (2) is hinged to the balance fulcrum (24) on one side of the front-stage balance beam (2), and the last-stage balance beam (2) is hinged to the rope end device base; the multi-stage balance beam (2) and the rope end device base are both provided with through holes, and the traction rope is passed through the through holes of the multi-stage balance beam (2) and the through holes of the rope end device base.

2. The method for automatically balancing the tension of the elevator traction rope ends according to claim 1, characterized in that: The automatic tension balancing device comprises two rows of rope end support hinge seats (1); the multi-stage balance beam (2) comprises a longitudinal balance beam (2) and a transverse balance beam (2); the front side and the rear side of the longitudinal balance beam (2) are respectively provided with three balance fulcrums (24); the left side and the right side of the transverse balance beam (2) are respectively provided with three balance fulcrums (24); and the side beams for connecting the longitudinal balance beam (2) and the transverse balance beam (2) are provided with balance fulcrums (24) on both sides and the front and rear sides. The balancing fulcrums (24) on the front and rear sides of the side beam are respectively hinged to the balancing fulcrums (24) at the middle positions of the front and rear sides of the upper longitudinal balance beam (2), and the balancing fulcrums (24) on the left and right sides of the side beam are respectively hinged to the balancing fulcrums (24) on one of the left and right sides of the lower transverse balance beam (2).

3. The method for automatically balancing the tension of an elevator traction rope end according to claim 1, characterized in that: The balancing fulcrum (24) is a circular hole or a cylinder, and different balancing beams (2) are hinged by inserting the cylinder into the circular hole.

4. The method for automatically balancing the tension of an elevator traction rope end according to claim 1, characterized in that: Gaps for providing rotation space for the balance beams are provided between adjacent balance beams (2) and between the last-stage balance beam (2) and the rope head device base (3).

5. The method for automatically balancing the tension of an elevator traction rope end according to claim 1, characterized in that: It also includes a tension adjustment mechanism, which includes a tension adjustment nut (4) located above the rope end support hinge seat (1), and a compression spring (5) located between the tension adjustment nut (4) and the rope end support hinge seat (1); The tension adjustment nut (4) cooperates with a thread provided on the traction rope, and the compression spring is sleeved on the traction rope.

6. The method for automatically balancing the tension of an elevator traction rope end according to claim 2, characterized in that: The multi-stage balance beam comprises a three-stage longitudinal balance beam (21), a first-stage side beam (22) and a first-stage transverse balance beam (23).

7. The method for automatically balancing the tension of the elevator traction rope ends according to claim 5, characterized in that: A bolt pre-tightening force sensor for monitoring the tension of the rope end is provided between the rope end hinged support and the compression spring.

8. The method for automatically balancing the tension of the elevator traction rope ends according to claim 7, characterized in that: Also includes: An automatic tension balancing device is installed on both the counterweight side and the car side of the elevator, and the measured tension p of each rope end on the counterweight side is obtained. i , and obtain the measured tension q of each rope end on the car side i , where i is the rope head number; When the measured tension q of each rope end on the car side i When the overload judgment condition is met, the overload protection is triggered, wherein the mathematical expression of the overload judgment condition is: Where n is the number of rope ends, q0 is the theoretical tension of each rope end on the car side at rated load; When the measured tension q of each rope end on the car side i And the measured tension p of each rope end on the counterweight side i When the tension unevenness judgment condition is met, the tension unevenness protection is triggered, where the tension unevenness judgment condition is one of the following mathematical expressions: When the measured tension q of each rope end on the car side i And the measured tension p of each rope end on the counterweight side i When the rope breaking judgment condition is met, the rope breaking protection is triggered, wherein the rope breaking judgment condition is or 9. The method for automatically balancing the tension of the elevator traction rope ends according to claim 8, characterized in that: Also includes: When the overload protection is triggered, the elevator stops and resumes operation when the elevator load returns to the rated load; When the uneven tension protection is triggered, the elevator stops and resumes operation when the tension of multiple rope ends is adjusted to balance; When the broken rope protection is triggered, the elevator stops and resumes operation when all the traction ropes are replaced and the tension at the rope ends is balanced after the traction ropes are replaced.

10. An automatic balancing device for the tension of an elevator traction rope end, characterized in that: The invention comprises a rope end support hinge seat (1), a multi-stage balance beam (2) and a rope end device base from top to bottom; each balance beam (2) comprises three balance fulcrums (24); the rope end support hinge seat (1) is fixedly connected to the rope end of the traction rope; the balance fulcrums (24) on both sides of the first-stage balance beam (2) are respectively hinged to the two rope end support hinge seats (1), the balance fulcrum (24) at the middle position of the rear-stage balance beam (2) is hinged to the balance fulcrum (24) on one side of the front-stage balance beam (2), and the last-stage balance beam (2) is hinged to the rope end device base; the multi-stage balance beam (2) and the rope end device base are both provided with through holes, and the traction rope is passed through the through holes of the multi-stage balance beam (2) and the through holes of the rope end device base.

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