Automatic tension adjusting device for elevator traction steel wire rope

Abstract

The utility model provides an automatic tension adjusting device for an elevator traction steel wire rope, and belongs to the technical field of elevator maintenance. The automatic tension adjusting device comprises a mounting plate used for being fixedly connected with an elevator car or a counterweight assembly. The mounting plate is provided with a plurality of hydraulic cylinders, fixed pulleys and movable pulleys which are in one-to-one correspondence with elevator traction steel wire ropes. The hydraulic cylinders, the fixed pulleys and the movable pulleys are arranged in a one-to-one correspondence mode. Hydraulic piston rods of the hydraulic cylinders are connected with axles of the corresponding movable pulleys. An elevator traction steel wire rope bypasses the corresponding movable pulley and then is wound on the corresponding fixed pulley; the automatic tension adjusting device further comprises a hydraulic oil tank, and hydraulic oil cavities of all the hydraulic cylinders are communicated with the interior of the hydraulic oil tank. According to the device, the tension adjusting precision of the elevator traction steel wire rope is improved, and the response timeliness of the elevator traction steel wire rope is improved.

Description

Technical Field

[0001] This utility model belongs to the field of elevator equipment technology, and relates to an automatic adjustment device for elevators, especially an automatic tension adjustment device for elevator traction steel wire rope. Background Technology

[0002] With the acceleration of urbanization and the continuous emergence of high-rise buildings and large commercial complexes, elevators, as a means of transportation in modern buildings, are becoming increasingly important. The safety, reliability, and operational efficiency of elevators directly affect people's daily lives and work efficiency. Currently, the number of elevators in China exceeds 10 million, and it continues to grow at a high rate annually. As the mainstream type of elevator, the vertically lifting traction elevator's core component is the traction steel wire rope. This traction steel wire rope is a flexible element connecting the car and the counterweight assembly. To ensure a sufficient safety factor, GB7588-2003, the "Safety Code for Elevator Manufacturing and Installation," stipulates that an elevator must have at least two traction steel wire ropes.

[0003] Due to errors in the manufacturing and installation of the wire ropes, as well as the uneven loading of the elevator system, each wire rope bears a different load. This results in uneven tension among the multiple traction wire ropes during operation due to inconsistent elongation. This tension imbalance leads to varying degrees of wear on the wire ropes, directly impacting their lifespan. Furthermore, the uneven stress causes uneven loading and tilting of components connected to the wire ropes, directly affecting the elevator's stability and comfort. Friction exists between the traction wire rope and the traction sheave, and uneven tension in the traction wire rope also leads to uneven wear between the traction wire rope and the sheave groove, creating a vicious cycle that significantly reduces the lifespan of the traction device and increases the probability of elevator accidents. Therefore, the uniformity of the tension in the traction wire ropes of an elevator directly affects its operational performance, passenger comfort, and equipment lifespan.

[0004] Elevator engineers typically determine the stress on each wire rope by repeatedly testing it at the same location using a tension meter. They then adjust the rope ends to balance the tension as much as possible. This testing method is highly mechanical and somewhat passive. With technological advancements, various methods have been adopted in practical applications to automatically adjust the tension of elevator traction wire ropes to address uneven tension. For example, manually adjusting the rope length or using spring devices to balance tension is simple but has low accuracy and relies heavily on experience. Alternatively, a motor-driven nut adjustment head can achieve high-precision adjustment, but this requires a complex control system and is costly. Furthermore, there are mechanical transmission methods based on pulley blocks. While simple in structure, this method can only be manually adjusted when the elevator is stationary, cannot adapt to dynamic tension changes, and has low adjustment accuracy. Utility Model Content

[0005] This application addresses the aforementioned problems in the existing technology by providing an automatic tension adjustment device for elevator traction steel wire ropes. The technical problem to be solved by this application is: how to simultaneously improve the accuracy and response speed of automatic tension adjustment of elevator traction steel wire ropes.

[0006] The automatic tension adjustment device for elevator traction steel wire rope provided in this application adopts the following technical solution:

[0007] An automatic tension adjustment device for elevator traction steel wire rope includes a mounting plate for fixed connection with the elevator car or counterweight assembly. The mounting plate is provided with a plurality of hydraulic cylinders corresponding to the elevator traction steel wire rope, a plurality of fixed pulleys corresponding to the elevator traction steel wire rope, and a plurality of movable pulleys corresponding to the elevator traction steel wire rope.

[0008] The hydraulic cylinder, fixed pulley, and movable pulley are arranged in a one-to-one correspondence. The hydraulic piston rod of the hydraulic cylinder is connected to the wheel axle of the corresponding movable pulley. The elevator traction steel wire rope passes around the corresponding movable pulley and then winds around the corresponding fixed pulley.

[0009] The automatic tension adjustment device also includes a hydraulic oil tank, and the hydraulic oil chambers of all the hydraulic cylinders are connected to the inside of the hydraulic oil tank.

[0010] The principle is as follows: This application addresses the problem of uneven tension in elevator traction steel wire ropes by achieving automatic balancing through hydraulic principles. The static pressure transmission characteristics of the hydraulic system ensure uniform pressure transmission of hydraulic oil within a closed system. A hydraulic system, constructed using components such as hydraulic cylinders and movable pulleys, automatically adjusts the tension of the elevator traction steel wire rope. The device in this application possesses dynamic balancing capabilities, allowing for real-time adjustment of the elevator traction steel wire rope tension to adapt to elevator operating conditions, reduce swaying and impact, improve comfort, and extend equipment lifespan.

[0011] Optionally, each of the fixed pulleys is mounted on the mounting plate via a connecting column, and each of the fixed pulleys is provided with a driving member for driving the fixed pulley to rotate in both directions and a locking member for locking the fixed pulley on one side.

[0012] The driving component can be a stepper motor or a hydraulic rotary motor, and the locking component can be a motor with a self-locking function integrated with the driving component, or it can be a separately set one-way ratchet and pawl structure. By adopting the above technical solution, the excess traction steel wire rope can be retracted by driving the fixed pulley to rotate, thereby improving the adjustable range of the entire device and avoiding the problem of limited adjustment range caused by the short stroke of the hydraulic cylinder.

[0013] Optionally, the mounting plate has several through holes, through which the hydraulic piston rod of the hydraulic cylinder passes vertically upward; the axle of the movable pulley is rotatably connected to the hydraulic piston rod of the corresponding hydraulic cylinder; the connecting column and the hydraulic cylinder are detachably fixed to the mounting plate.

[0014] By adopting the above technical solution, the modular design allows for the selection of the number of hydraulic cylinders, fixed pulleys, and movable pulleys as needed. This enables flexible adjustments based on the number and arrangement of wire ropes, facilitating installation and maintenance and adapting to different elevator models. It also reduces the difficulty and cost of installation and modification.

[0015] Optionally, an oil inlet pipe is provided on the upper side or near the upper side of the hydraulic oil tank, and an oil outlet pipe is provided on the lower side or near the lower side of the hydraulic oil tank. An oil inlet valve is provided on the oil inlet pipe, and an oil outlet valve is provided on the oil outlet pipe, for controlling the injection and output of hydraulic oil into and out of the hydraulic oil tank.

[0016] By adopting the above technical solutions, a closed-loop hydraulic circuit design is achieved, reducing the risk of hydraulic oil leakage, improving system sealing and reliability, extending service life, and reducing maintenance costs.

[0017] Optionally, the mounting plate, the movable pulley, or the hydraulic piston rod of the hydraulic cylinder is provided with a warning line and a limit sensor for displaying the lifting displacement of the movable pulley.

[0018] By adopting the above technical solution, the lifting displacement of the movable pulley can be fed back. When the set value is reached, the rotation of the fixed pulley can tighten a certain length of traction steel wire rope, thereby maintaining the continuous and effective adjustment of the steel wire rope tension.

[0019] Optionally, the ports of the oil inlet and outlet pipelines are equipped with impurity adsorption fibers, and the hydraulic oil tank is equipped with a flexible buffer panel.

[0020] By adopting the above technical solution, the hydraulic oil tank can collect excess hydraulic oil to prevent leakage; it can also replenish the hydraulic oil in the hydraulic cylinder in a timely manner. Impurity adsorption fibers are used to adsorb and remove impurities from the hydraulic oil.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. The automatic tension adjustment device in this application can accurately adjust the tension of the wire rope, ensuring that the tension of multiple traction wire ropes is balanced during operation, thereby reducing the wear of the wire rope and traction sheave, extending service life, reducing the frequency of replacement and maintenance, and saving maintenance costs.

[0023] 2. The automatic tension adjustment device in this application has dynamic balancing capability, which can adjust the tension of the elevator traction steel wire rope in real time, adapt to the elevator operating status, reduce swaying and impact, and improve comfort.

[0024] 3. The automatic tension adjustment device in this application improves the adjustment accuracy and response time through the combined design of hydraulic cylinder, fixed pulley and movable pulley.

[0025] 4. The automatic tension adjustment device in this application automatically collects excess wire rope through the design of fixed pulleys and movable pulleys, ensuring neatness and order, avoiding tangling and knotting, and improving operational stability. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the automatic tension adjustment device in this application.

[0027] In the picture:

[0028] 10. Mounting plate; 11. Through hole;

[0029] 20. Hydraulic cylinder; 21. Hydraulic piston rod;

[0030] 30. Fixed pulley; 31. Connecting column;

[0031] 40. Movable pulley;

[0032] 50. Hydraulic oil tank; 51. Oil inlet pipe; 52. Oil outlet pipe;

[0033] 60. Steel wire rope. Detailed Implementation

[0034] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0035] According to the China Elevator Association's annual report, there are over 10 million elevators in China, and approximately 15% of malfunctions are caused by uneven tension in the elevator traction steel wire ropes. Uneven tension in the traction steel wire ropes increases the wire breakage rate by 30%, increasing the risk of fracture and potentially leading to car falls, personal injury, and equipment damage. When the traction steel wire rope tension is uneven, the rope with higher tension will experience accelerated wear on the traction sheave, altering the sheave groove shape, reducing transmission efficiency and reliability, and increasing maintenance costs and downtime risks. Uneven tension in the traction steel wire ropes can also cause car vibration, reducing ride comfort and potentially causing passenger panic, affecting normal use, especially in high-end office buildings and hotels, easily leading to complaints and damaging brand image. It is evident that uneven tension in elevator traction steel wire ropes significantly affects the normal operation and lifespan of elevators and is highly likely to cause safety accidents. Statistics show that annual maintenance costs due to steel wire rope tension problems exceed 1.2 billion yuan, including repairs, downtime losses, maintenance labor costs, and potential legal risks.

[0036] Existing automatic tension adjustment devices for elevator traction steel wire ropes generally suffer from problems such as low efficiency, low accuracy, slow response speed, and high manufacturing cost. This application provides a new automatic tension adjustment device for elevator traction steel wire ropes to solve the above problems.

[0037] Reference Figure 1 As shown, in this embodiment, the automatic tension adjustment device for the elevator traction steel wire rope includes a mounting plate 10 for fixed connection with the elevator car or counterweight assembly. The mounting plate 10 is provided with a plurality of hydraulic cylinders 20 corresponding to the elevator traction steel wire rope 60, a plurality of fixed pulleys 30 corresponding to the elevator traction steel wire rope 60, and a plurality of movable pulleys 40 corresponding to the elevator traction steel wire rope 60. The hydraulic cylinders 20, fixed pulleys 30, and movable pulleys 40 are arranged in a one-to-one correspondence. The hydraulic piston rod 21 of the hydraulic cylinder 20 is connected to the wheel axle of the corresponding movable pulley 40. The elevator traction steel wire rope 60 passes around the corresponding movable pulley 40 and then winds around the corresponding fixed pulley 30. The automatic tension adjustment device also includes a hydraulic oil tank 50, and the hydraulic oil chambers of all the hydraulic cylinders 20 are connected to the interior of the hydraulic oil tank 50. The mounting plate 10 has several through holes 11, through which the hydraulic piston rod 21 of the hydraulic cylinder 20 passes vertically upward. The axle of the movable pulley 40 is rotatably connected to the hydraulic piston rod 21 of the corresponding hydraulic cylinder 20. The connecting column 31 and the hydraulic cylinder 20 are detachably fixed to the mounting plate 10. The modular design allows for selection of the number of hydraulic cylinders 20, fixed pulleys 30, and movable pulleys 40 as needed, enabling flexible adjustment based on the number and arrangement of wire ropes 60, facilitating installation and maintenance, and adapting to different elevator models. This embodiment uses 6 hydraulic cylinders 20, 6 fixed pulleys 30, and 6 movable pulleys 40 as an example.

[0038] Reference Figure 1As shown, an oil inlet pipe 51 is located on the upper side or near the upper side of the hydraulic oil tank 50, and an oil outlet pipe 52 is located on the lower side or near the lower side of the hydraulic oil tank 50. An oil inlet valve is installed on the oil inlet pipe 51, and an oil outlet valve is installed on the oil outlet pipe 52, used to control the injection and output of hydraulic oil into and out of the hydraulic oil tank 50. Impurity-absorbing fibers are installed at the ports of the oil inlet pipe 51 and the oil outlet pipe 52, and a flexible buffer panel is installed inside the hydraulic oil tank 50. The hydraulic oil tank 50 can collect excess hydraulic oil to prevent leakage; it can also replenish the hydraulic oil in the hydraulic cylinder 20 in a timely manner. The impurity-absorbing fibers are used to absorb and remove impurities in the hydraulic oil.

[0039] In this embodiment, the hydraulic piston rod 21 of the mounting plate 10, the movable pulley 40, or the hydraulic cylinder 20 is equipped with a warning line and a limit sensor to display the lifting displacement of the movable pulley 40. This allows feedback on the lifting displacement of the movable pulley 40. When a set value is reached, the fixed pulley 30 rotates to tighten a certain length of the traction steel wire rope 60, thereby maintaining continuous and effective adjustment of the tension of the steel wire rope 60.

[0040] Furthermore, in this application, each fixed pulley 30 is mounted on the mounting plate 10 via a connecting post 31. Each fixed pulley 30 has a driving component for driving its forward and reverse rotation and a locking component for locking it on one side. The driving component can be a stepper motor or a hydraulic rotary motor, and the locking component can be a self-locking motor integrated with the driving component, or a separately configured one-way ratchet and pawl structure. By driving the fixed pulley 30 to rotate through the driving component, excess traction steel wire rope 60 is retracted, which improves the adjustability range of the entire device and avoids the problem of limited adjustment range caused by the short stroke of the hydraulic cylinder 20.

[0041] The principle is as follows: This application addresses the problem of uneven tension in the elevator traction steel wire rope 60 by achieving automatic balancing through hydraulic principles. Specifically, according to Pascal's law, the hydraulic system transmits pressure evenly, ensuring consistent pressure in each hydraulic cylinder 20 and achieving automatic tension balancing of the steel wire rope 60. The static pressure transmission characteristics of the hydraulic system ensure uniform pressure transmission of the hydraulic oil within the closed system. The hydraulic system, constructed through components such as the hydraulic cylinders 20 and the movable pulleys 40, automatically adjusts the tension of the elevator traction steel wire rope 60. The device in this application possesses dynamic balancing capabilities, allowing for real-time adjustment of the elevator traction steel wire rope 60's tension to adapt to elevator operation, reduce swaying and impact, improve comfort, and extend equipment lifespan. The device in this application can precisely adjust the tension of the steel wire rope 60, reducing wear on the steel wire rope 60 and traction sheaves, extending their service life, reducing replacement and maintenance frequency, and saving maintenance costs. The entire device has a simple structure, is easy to install, and has low cost. The automatic adjustment function avoids errors from manual adjustment, improves safety and reliability, reduces the risk of safety accidents, and ensures passenger safety, resulting in significant social and economic benefits.

[0042] The device in this application adopts a modular design and consists of multiple balanced hydraulic units. It can be flexibly adjusted according to the number and arrangement of the elevator traction steel wire ropes 60, which improves flexibility, scalability and maintainability, adapts to different elevator models, and reduces the difficulty and cost of installation and modification.

[0043] The device in this application adopts a closed hydraulic circuit design, which reduces the risk of hydraulic oil leakage, improves system sealing and reliability, extends service life, and reduces maintenance costs.

[0044] Referring to Table 1 below, the four common automatic tension adjustment devices for elevator traction steel wire ropes on the market are: spring type, motor driven type, pure hydraulic type, and pulley block type.

[0045] From the perspective of adjustment accuracy: Spring type: Lower adjustment accuracy, typically ±15%, unable to achieve high-precision adjustment. Spring-type devices mainly rely on the elastic deformation of springs to adjust tension, but their elastic deformation range is limited, making it difficult to adapt to dynamic changes in wire rope tension. Motor-driven type: High adjustment accuracy, reaching ±5%, suitable for elevators with high precision requirements. Motor-driven devices achieve high-precision tension adjustment by rotating the adjusting head of the nut driven by a motor, but require the installation of a motor and related control equipment, resulting in a relatively complex structure and higher cost. Pure hydraulic type: High adjustment accuracy, reaching ±5%, but with a slow response speed. While pure hydraulic devices can achieve high-precision adjustment, their hydraulic system has a relatively slow response speed, potentially unable to quickly adapt to sudden changes in wire rope tension. Pulley block type: Lower adjustment accuracy, typically ±10%, difficult to achieve high-precision adjustment. Pulley block devices mainly rely on the mechanical transmission of pulley blocks, resulting in relatively low adjustment accuracy, and can only be manually adjusted when the elevator is stopped.

[0046] From the perspective of dynamic adjustment capability: Spring-type: Cannot achieve tension adjustment in a dynamic state; can only be manually adjusted under static conditions. Spring-type devices have low adjustment accuracy and cannot adapt to dynamic changes in wire rope tension; manual adjustment is only possible when the elevator is stopped. Motor-driven: Can automatically adjust tension in a dynamic state, but requires a sophisticated control system. Motor-driven devices require the installation of a motor and related control equipment; while achieving dynamic adjustment, their control system is complex and costly. Pure hydraulic: Can automatically adjust tension in a dynamic state, but has a slow response speed. Although pure hydraulic devices can achieve dynamic adjustment, their relatively slow response speed may not be able to quickly adapt to sudden changes in wire rope tension. Pulley block type: Cannot achieve tension adjustment in a dynamic state; can only be manually adjusted under static conditions. Pulley block devices have low adjustment accuracy and cannot adapt to dynamic changes in wire rope tension; manual adjustment is only possible when the elevator is stopped.

[0047] From a structural complexity perspective: Spring-driven: Simple structure, relying mainly on the elastic deformation of the spring. Although simple, it has low adjustment precision, and the spring is prone to fatigue, requiring periodic replacement. Motor-driven: Complex structure, requiring the installation of a motor and related control equipment. Motor-driven devices are complex, costly, and require high performance from the motor and control system. Pure hydraulic: Complex structure, requiring a hydraulic system and related components. Pure hydraulic devices are complex, costly, and require high maintenance standards for the hydraulic system. Pulley block type: Simple structure, relying mainly on the mechanical transmission of the pulley block. Although simple, it has low adjustment precision and can only be adjusted manually under static conditions.

[0048] From a maintenance cost perspective: Spring-driven: Low maintenance cost, but springs are prone to fatigue and require regular replacement. While spring-driven devices have low maintenance costs, their lifespan is short, requiring frequent spring replacements. Motor-driven: High maintenance cost, requiring regular checks of the motor and control system. Motor-driven devices have high maintenance costs, and the failure rate of the motor and control system is relatively high. Pure hydraulic: High maintenance cost, requiring regular checks of the hydraulic system's sealing and hydraulic oil condition. Pure hydraulic devices have high maintenance costs, and the hydraulic system requires sophisticated maintenance. Pulley block: Low maintenance cost, but the pulley block's adjustment range is limited, requiring regular checks of pulley wear. While pulley block devices have low maintenance costs, their adjustment precision is low, and the pulleys are prone to wear.

[0049] From a manufacturing cost perspective: Spring-driven: Low manufacturing cost, but limited performance. While low in cost, spring-driven devices have low adjustment precision and short lifespan. Motor-driven: High manufacturing cost, requiring the installation of a motor and related control equipment. Motor-driven devices are expensive and place high demands on the performance of the motor and control system. Pure hydraulic: High manufacturing cost, requiring a hydraulic system and related components. Pure hydraulic devices are expensive, and the maintenance requirements for the hydraulic system are high. Pulley block: Low manufacturing cost, but limited performance. While low in cost, pulley block devices have low adjustment precision, and the pulleys are prone to wear.

[0050] In terms of service life: Spring-driven: Short service life, typically 3-5 years. Springs are prone to fatigue and require frequent replacement, resulting in a shorter lifespan. Motor-driven: Medium service life, typically 5-8 years. The failure rate of the motor and control system is relatively high, requiring regular maintenance and replacement. Pure hydraulic: Long service life, reaching over 10 years. Pure hydraulic devices have a long service life, but the maintenance requirements for the hydraulic system are higher. Pulley block type: Medium service life, typically 5-8 years. Pulleys wear easily and require regular inspection and replacement.

[0051] From an adaptability perspective: Spring-driven: Poor adaptability, difficult to adapt to different elevator models. Spring-driven devices have low adjustment precision and are difficult to adapt to dynamic changes in wire rope tension. Motor-driven: Highly adaptable, suitable for elevators with high precision requirements. Although motor-driven devices are highly adaptable, their structure is complex and costly. Pure hydraulic: Highly adaptable, suitable for elevators with high precision requirements. Although pure hydraulic devices are highly adaptable, their response speed is slow and maintenance requirements are high. Pulley block: Poor adaptability, difficult to adapt to different elevator models. Pulley block devices have low adjustment precision and can only be manually adjusted under static conditions.

[0052] From an energy-saving and environmental protection perspective: Spring-type: No energy-saving or environmental protection features. Although spring-type devices have a simple structure, they cannot achieve energy conservation and environmental protection. Motor-driven: No energy-saving or environmental protection features; motor operation consumes electrical energy. Although motor-driven devices can achieve high-precision adjustment, motor operation increases energy consumption. Pure hydraulic: Uses a closed hydraulic circuit, reducing the risk of hydraulic oil leakage and achieving energy conservation and environmental protection. Although pure hydraulic devices can achieve energy conservation and environmental protection, their response speed is relatively slow. Pulley block type: No energy-saving or environmental protection features. Although pulley block devices have a simple structure, they cannot achieve energy conservation and environmental protection.

[0053] The automatic adjustment device in this embodiment boasts high adjustment accuracy: reaching ±5%, achieved through high-precision control of the hydraulic system. This high-precision adjustment effectively reduces wire rope wear, extends its service life, and ensures smooth elevator operation. It features a simple structure and convenient maintenance: the device consists of components such as hydraulic cylinders, moving pulleys, fixed pulleys, and ratchet. This structural design ensures adjustment accuracy while facilitating installation and maintenance. It has strong adjustment capability: automatically adjusting tension during elevator operation to ensure the wire rope remains balanced under both dynamic and static conditions. This dynamic adjustment capability significantly improves the smoothness and safety of elevator operation, reducing swaying and noise caused by uneven tension. Maintenance costs are low: the device only requires checking the hydraulic system's sealing and hydraulic oil condition during elevator maintenance cycles. Manufacturing costs are low: the device has a simple structure and mature processing technology. Service life is long: the device has no long-term moving parts, resulting in minimal wear. It is highly adaptable: suitable for different elevator models, possessing strong versatility and scalability. The modular design allows for flexible configuration based on the number and arrangement of wire ropes in different elevators. Energy-saving and environmentally friendly: The closed hydraulic circuit reduces the risk of hydraulic oil leakage, thus saving energy and protecting the environment.

[0054] The automatic adjustment device in this embodiment has significant advantages in terms of adjustment accuracy, dynamic adjustment capability, service life, energy saving and environmental protection, and real-time monitoring. Although its manufacturing and maintenance costs are relatively high, its high performance and reliability make it widely applicable in the elevator industry, especially suitable for elevator systems with high requirements for safety and operating efficiency.

[0055] This embodiment, through optimized design of the hydraulic and pulley-type device, not only improves adjustment accuracy and dynamic adjustment capability but also significantly reduces maintenance costs and energy consumption. Its modular design and real-time monitoring system allow it to flexibly adapt to different elevator models, playing a vital role in both new elevator pre-installation and the renovation of older elevators. Furthermore, this device has a long service life, is energy-efficient and environmentally friendly, and aligns with modern elevator technology development trends. In contrast, while spring-type and pulley-type devices are simple in structure and low in cost, they have low adjustment accuracy, cannot achieve dynamic adjustment, and have higher maintenance costs. Motor-driven and purely hydraulic devices offer high adjustment accuracy but are complex in structure, expensive, and require high maintenance standards for the control and hydraulic systems. Therefore, in terms of overall performance and economic benefits, the hydraulic and pulley-type device is more advantageous.

[0056] In summary, the automatic tension adjustment device in this embodiment, with its advantages of high precision, dynamic adjustment capability, long service life, energy saving and environmental protection, and real-time monitoring, has become an ideal choice for the elevator industry to improve safety and operational efficiency.

[0057]

[0058]

[0059] Table 1: Comparison of this technical solution with other existing technologies

[0060] The specific embodiments described herein are merely illustrative examples of the spirit of this application. Those skilled in the art to which this application pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this application or exceeding the scope defined by the appended claims.

Claims

1. A tension automatic adjusting device of an elevator hoisting wire rope, characterized by, The tension automatic adjusting device comprises a mounting plate (10) for being fixed with an elevator car or a counterweight assembly, a plurality of hydraulic cylinders (20) corresponding to the elevator hoisting steel wire ropes (60), a plurality of fixed pulleys (30) corresponding to the elevator hoisting steel wire ropes (60), and a plurality of movable pulleys (40) corresponding to the elevator hoisting steel wire ropes (60) are arranged on the mounting plate (10); The hydraulic cylinders (20), the fixed pulleys (30) and the movable pulleys (40) are arranged in one-to-one correspondence, the hydraulic piston rods (21) of the hydraulic cylinders (20) are connected with the wheel shafts of the corresponding movable pulleys (40), and the elevator hoisting steel wire ropes (60) are wound on the corresponding fixed pulleys (30) after passing through the corresponding movable pulleys (40). The tension automatic adjusting device further comprises a hydraulic oil tank (50), and the hydraulic oil cavities of all the hydraulic cylinders (20) are connected with the inside of the hydraulic oil tank (50).

2. The tension automatic adjusting device of an elevator hoisting wire rope according to claim 1, characterized in that, Each fixed pulley (30) is installed on the mounting plate (10) through a connecting column (31), and one side of each fixed pulley (30) is provided with a driving member for driving the fixed pulley (30) to rotate forward and backward and a locking member for locking the fixed pulley (30).

3. The tension automatic adjusting device of an elevator hoisting rope according to claim 2, characterized in that, A plurality of through holes (11) are formed in the mounting plate (10), the hydraulic piston rods (21) of the hydraulic cylinders (20) vertically pass through the corresponding through holes (11) upward, the wheel shafts of the movable pulleys (40) are rotatably connected with the hydraulic piston rods (21) of the corresponding hydraulic cylinders (20), and the connecting columns (31) and the hydraulic cylinders (20) are detachably fixed on the mounting plate (10).

4. The tension automatic adjusting device of an elevator hoisting rope according to claim 1 or 2, characterized in that, An oil inlet pipeline (51) is arranged on the upper side or the position close to the upper side of the hydraulic oil tank (50), an oil outlet pipeline (52) is arranged on the lower side or the position close to the lower side of the hydraulic oil tank (50), an oil inlet valve is arranged on the oil inlet pipeline (51), an oil outlet valve is arranged on the oil outlet pipeline (52), and the oil inlet valve and the oil outlet valve are used for controlling the injection and output of the hydraulic oil into the hydraulic oil tank (50).

5. The tension automatic adjusting device of an elevator hoisting rope according to claim 4, characterized in that, A warning line and a limit sensor for displaying the lifting displacement of the movable pulley (40) are arranged on the mounting plate (10), the movable pulley (40) or the hydraulic piston rod (21) of the hydraulic cylinder (20).

6. The tension automatic adjusting device of an elevator hoisting rope according to claim 4, characterized in that, Impurity adsorption fibers are arranged on the ports of the oil inlet pipeline (51) and the oil outlet pipeline (52), and a flexible buffer panel is arranged in the hydraulic oil tank (50).

Images