Steel wire rope tensioning device

Abstract

The utility model relates to the field of elevators, in particular to a steel wire rope tensioning device which comprises a protective cover, a rope wheel assembly, a spring assembly, a support, a bottom frame and a travel switch, the support is installed on the bottom frame, the protective cover, the rope wheel assembly, the spring assembly and the travel switch are all installed on the support, and the spring assembly comprises a spring pull rod, a spring seat and a compression spring. A spring seat and a compression spring are sequentially installed on the periphery of the spring pull rod from top to bottom, and the width of the spring pull rod is similar to the inner diameter of the compression spring. The spring pull rod plays a more positive role in guiding the compression spring, so that the compression spring is kept relatively vertical in appearance, the elastic potential energy loss is reduced, and the tensioning force is more stable; according to the tensioning device, the occupied tensioning space is optimized, the length, the width and the height are comprehensively optimized, the structure of the tensioning device is compact, the occupied space is reduced, and therefore the applicability of the tensioning device to different installation environments is improved.

Description

Technical Field

[0001] This utility model relates to the field of elevators, specifically a wire rope tensioning device. Background Technology

[0002] Elevators are indispensable vertical transportation tools in modern buildings, and their safety is a core concern. The speed governor is a key component ensuring elevator safety. By monitoring the car's speed in real time and triggering the safety brake when it exceeds the speed limit, it can stop the car and prevent falls. The effectiveness of the speed governor highly depends on the tension control of the governor's wire rope (or cable) by the tensioning device. If the wire rope is slack, the speed governor may fail to accurately sense the speed, or the safety brake may malfunction, thus threatening the safety of the passengers.

[0003] Existing tensioning devices mostly utilize the elastic force of springs to automatically compensate for the deformation of the wire rope. However, traditional spring structures suffer from tension attenuation. For example, to maintain spring stability, the spring height cannot be too high, otherwise, spring stability will decrease, causing the spring force to gradually increase with the spring height. Therefore, the spring tensioning stroke is generally low, usually around 10-15mm, making it suitable for elevators with lifting heights typically not exceeding 15m. Furthermore, improving the adaptability to different tensioning heights would make the spring tensioning design very complex, significantly increasing costs and making it uneconomical. Utility Model Content

[0004] To achieve the above objectives, the present invention aims to provide a wire rope tensioning device that can solve the problems existing in the background art. The present invention provides the following technical solution:

[0005] A wire rope tensioning device includes a protective cover, a rope pulley assembly, a spring assembly, a bracket, a base frame, and a limit switch. The bracket is mounted on the base frame, and the protective cover, rope pulley assembly, spring assembly, and limit switch are all mounted on the bracket. The spring assembly includes a spring rod, a spring seat, and a compression spring. The bracket has a guide hole, through which the lower end of the spring rod passes and is locked with a fastener. The spring seat and compression spring are installed sequentially from top to bottom around the spring rod. The width of the spring rod is similar to the inner diameter of the compression spring. The width of the spring rod effectively guides the compression spring, ensuring it remains straight and does not bend, thus making the spring force more stable. The tensioning device design largely eliminates the need to consider the reduced spring stability caused by excessively high compression spring height, allowing for increased tensioning device stroke. This enables its use in elevators with higher lifting heights. The protective cover, bracket, and base frame require only simple sheet metal processing, eliminating the need for deep machining, directly reducing manufacturing costs and indirectly lowering subsequent warehousing and assembly costs.

[0006] As a further embodiment of this invention, a protective cover can be used to cover the rope wheel assembly, thereby protecting the rope wheel assembly and extending the service life of the device.

[0007] As a further embodiment of this utility model: the rope pulley assembly includes a rope pulley, a hole retaining ring, a bearing, a spacer sleeve, and a bolt group. The wire rope is wound on the rope pulley. The main function of the rope pulley assembly is to wind the wire rope and provide a force point for tensioning the wire rope, and it can still rotate smoothly and without obstruction after the wire rope is tensioned.

[0008] As a further solution of this utility model: the fixing component adopts fixing bolts, the component is easy to purchase, and the use effect is good.

[0009] As a further solution of this utility model: the spring assembly is installed on the bent surface of the bracket, which can save space and also achieves the ultimate in thickness direction, so that the space occupied by the tensioning device can be minimized. The height and width directions are compactly designed, and the overall thickness of the tensioning device is almost the same as that of the limit switch, thus improving applicability.

[0010] As a further embodiment of this utility model: the bracket is made of sheet metal material and bending forming process, and is the main structure of the tensioning device. It has a compact structure and no other accessories, and the structure is extremely simple.

[0011] As a further embodiment of this invention, a rope-stopping shaft is also installed on the bracket, which can ensure that the wire rope will not come off the rope wheel, thus ensuring the safety of elevator operation. It can also adjust the position of the wire rope, maintain the correct tension of the wire rope, reduce the wear of the wire rope, and extend the service life of the wire rope and the rope wheel.

[0012] As a further aspect of this invention: the upper end of the spring rod is provided with a fan-shaped protrusion, which is connected to the compression spring through a flat washer. The flat washer can limit the compression spring and serve as the force-bearing surface of the compression spring. When the bracket is lifted, the bracket separates from the base frame and continuously increases the compression of the compression spring until the compression spring is compressed to the design value and the tension is at the design maximum. If the wire rope elongates due to aging or environmental issues, the bracket will move downwards under the action of the spring force until the limit switch touches the base frame, thereby cutting off the power. At this time, it is only necessary to readjust the length of the wire rope to raise the tensioning device to the design height.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This product optimizes the structure, reducing the number of components in the tensioning device and simplifying the manufacturing process, thereby lowering the manufacturing cost of the tensioning device and improving product competitiveness.

[0015] This product optimizes the assembly and debugging of spring components, enabling assembly of spring components to be carried out in an assembly line manner, greatly improving assembly efficiency.

[0016] The spring rod of this product plays a more positive role in guiding the compression spring, keeping the compression spring relatively vertical, thereby reducing the loss of elastic potential energy and making the tension more stable.

[0017] This product has optimized the space occupied by tensioning, with comprehensive optimization of length, width, and height, resulting in a compact structure and reduced space occupation of the tensioning device, thereby improving its applicability to different installation environments. Attached Figure Description

[0018] Figure 1 This is a perspective view of the wire rope tensioning device in the embodiment of this utility model.

[0019] Figure 2 This is a side view of the wire rope tensioning device in an embodiment of this utility model.

[0020] Figure 3 for Figure 2 A cross-sectional view along the BB direction.

[0021] Figure 4 This is a schematic diagram of the spring assembly.

[0022] Figure 5 This is a schematic diagram of the rope pulley assembly.

[0023] Figure 6 A schematic diagram of the structure when a flat washer is used for the spring assembly.

[0024] Figure 7 This is a schematic diagram of an existing spring device.

[0025] Figure 8 This is a schematic diagram of the steel wire rope tensioning device in use according to an embodiment of this utility model.

[0026] Figure 9 This is a schematic diagram showing the installation of the spring rod and compression spring in the spring assembly.

[0027] In the diagram: 1-protective cover; 2-rope pulley assembly; 3-spring assembly; 4-bracket; 5-base frame; 6-spring pull rod; 7-spring seat; 8-compression spring; 9-fixture; 10-limit switch; 11-speed limiter; 12-wire rope; 13-tensioning device; 14-rope pulley; 15-hole retaining ring; 16-bearing; 17-bolt assembly; 18-spacer sleeve; 19-screw; 20-rope guide shaft; 21-expansion bolt; 22-flat washer. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0030] Example 1, please refer to Figures 1-9 This utility model provides a wire rope tensioning device, including a protective cover 1, a rope wheel assembly 2, a spring assembly 3, a bracket 4, a base frame 5, and a limit switch 10. The bracket 4 is mounted on the base frame 5, and the protective cover 1, rope wheel assembly 2, spring assembly 3, and limit switch 10 are all mounted on the bracket 4. The spring assembly 3 includes a spring rod 6, a spring seat 7, and a compression spring 8. The bracket 4 has a guide hole, and the lower end of the spring rod 6 passes through the guide hole and is locked with a fixing piece 9. The spring seat 7 and the compression spring 8 are installed sequentially from top to bottom around the spring rod 6. The width of the spring rod 6 is similar to the inner diameter of the compression spring 8. Currently, most spring tensioning devices on the market use screws 19 for fixing, so spring adjustment needs to be achieved by adjusting the position of the nut, which results in low assembly efficiency. The structure of the existing spring device is shown below. Figure 7Because the inner diameter of the spring differs significantly from the diameter of the screw 19, and due to the spring's height-to-diameter ratio, the spring itself will exhibit varying degrees of skewness under stress. Existing spring devices often result in noticeable bending of the spring. However, this product abandons the bolt-mounted spring method, employing a steel plate spring rod 6 to fix the compression spring 8. The width of the spring rod 6 is close to the inner diameter of the compression spring 8, effectively guiding and supporting the compression spring 8 in its width direction. This results in superior straightness compared to traditional bolt-fixed methods, ensuring the compression spring 8 remains straight and does not bend, leading to more stable spring force. The compression spring 8 in this product's spring assembly 3 remains straight after installation, eliminating the need to consider excessive height of the compression spring 8 in the design of the tensioning device 13. The reduced spring stability allows for an increased stroke in the tensioning device 13, enabling its use in elevators with higher lifting heights. By using a spring rod 6 (steel plate) instead of a traditional screw to fix the compression spring 8, the width of the spring rod 6 can be adjusted according to the inner diameter of different compression springs 8, providing internal support and significantly improving spring stability. Therefore, the height of the compression spring 8 can be increased to meet design requirements. This patented product increases the tensioning stroke from 15mm to 35mm, applicable to elevators up to 35m in height, almost satisfying all low-to-medium height pitless and small-pit elevators, greatly improving tensioning applicability. The protective cover 1, bracket 4, and base frame 5 require only simple sheet metal processing, eliminating the need for deep machining, directly reducing manufacturing costs and indirectly lowering subsequent warehousing and assembly costs. A structural diagram of this product in use is shown below. Figure 8 ,from Figure 8As can be seen, the tensioning device 13 is usually installed in the elevator shaft pit, located at the lowest end of the elevator. The speed governor 11 is firmly fixed to the upper floor by the mounting bracket. The tensioning device 13 is fixed with expansion bolts 21 and then connected to the upper speed governor 11 through a steel wire rope 12. The tensioning device 13 provides tension, making the steel wire rope 12 taut and tightly fitted with the upper and lower pulleys 14. If the steel wire rope 12 is shortened at this time, the tensioning device 13 will be pulled up, but the base frame 5 is fixed to the ground and will remain on the ground. The two spring rods 6 connected to the base frame 5 will also remain on the ground. At this time, the compression spring 8 will be compressed and generate a downward force, making the steel wire rope 12 taut. This product has the following functions: 1. Maintaining the tension of the steel wire rope 12: The elastic force of the compression spring 8 always applies tension to the steel wire rope 12, preventing the steel wire rope 12 from loosening due to long-term use or temperature changes, ensuring sufficient friction between the speed governor rope and the speed governor pulley, thereby accurately detecting the elevator running speed. 2. Automatic tension adjustment: When the wire rope 12 elongates naturally or slackens unexpectedly, the compression spring 8 automatically adjusts the displacement of the rope pulley 14 through elastic deformation (such as compression or tension) to compensate for the elongation of the wire rope 12 and maintain stable tension. 3. Trigger safety protection: If the wire rope 12 becomes excessively slack or breaks, the elastic force of the compression spring 8 will cause the tensioning device 13 to move downwards or reset, triggering the rope breakage protection switch and immediately cutting off the elevator safety circuit, forcing the elevator to stop. 4. Adaptability to environmental changes: The floating design of the compression spring 8 allows the tensioning device 13 to move up and down, flexibly responding to changes in length caused by factors such as temperature changes within the shaft and thermal expansion and contraction of the wire rope 12. Two compression springs 8 located on both sides of the tensioning device 13 are the main source of tension. Of course, the weight of the rope pulley 14 and the support 4 will also provide some tension, but since their weight is small, they are not considered here. The upper end of the compression spring 8 is limited by the spring rod 6. The lower end of the spring rod 6 passes through the guide hole of the support 4 until the lower end is connected to the base frame 5. At the point where the lower end of the compression spring 8 contacts the lower plane of the support 4, the support 4 will be subjected to a downward force due to the preload of the compression spring 8. The support 4 and the base frame 5 are floatingly connected through the compression spring 8. When the base frame 5 is fixed to the ground by the expansion bolt 21, the wire rope 12 can be shortened. The rope pulley 14 will drive the support 4 to move upward. During the upward movement of the support 4, the spring is continuously compressed until the optimal design height is reached. At this time, the compression spring 8 is in the best working state, and the elastic potential energy of the compression spring 8 is the maximum, that is, the tension is the maximum.Although the wire rope 12 has high strength, it is also affected by temperature and humidity, which can cause the diameter of the wire rope 12 to become thicker or thinner, and ultimately affect the total length of the wire rope 12, that is, the elongation of the wire rope 12. If the length of the wire rope 12 changes, the tensioning device 13 will adjust itself within a certain range, that is, the rope pulley 14 and the bracket 4 will rise or fall appropriately, and the compression spring 8 will also be compressed or released accordingly. Of course, the change in elasticity is considered in the design, and its change range is within the acceptance range of the speed limiter 11, so as to realize automatic adjustment of tension. In general, it is more common for the wire rope 12 to become longer, not only due to the elongation rate, but also because the wire rope 12 is under tension all year round, causing changes in length. Therefore, the tensioning device 13 is equipped with a limit switch 10 in the downward direction to prevent the bracket 4 from contacting the base frame 5 due to excessive slack of the wire rope 12. At this time, the base frame 5 will share the tension of the wire rope 12, causing the tension to drop sharply and affecting the function of the speed governor 11. Of course, we also need to consider the case where the wire rope 12 breaks. Therefore, we set a limit switch 10 in the downward direction to cut off the power to the bracket 4 before it contacts the base frame 5, so as to stop the elevator and prevent the elevator from running in the case of the speed governor 11 failure, which can trigger the safety protection.

[0031] In one embodiment of this utility model, the base frame 5 is fixed to the ground with expansion bolts 21. The base frame 5 adopts a bending design, which can not only satisfy the function of fixing the spring rod 6, but also increase the overall strength of the base frame 5. Therefore, the thickness of the plate can be reduced, thereby achieving the purpose of saving costs.

[0032] In one embodiment of this utility model, the protective cover 1 covers the rope wheel assembly 2, which can protect the rope wheel assembly 2 and extend the service life of the device.

[0033] In one embodiment of this utility model, the rope pulley assembly 2 includes a rope pulley 14, a retaining spring 15, a bearing 16, a spacer sleeve 18, and a bolt group 17. The wire rope 12 is wound on the rope pulley 14. The main function of the rope pulley assembly 2 is to wind the wire rope 12 and provide a force point for tensioning the wire rope 12, and to allow the wire rope 12 to rotate smoothly and without obstruction after tensioning. Furthermore, there are two retaining springs 15, which are respectively installed above and below the rope pulley 14. The bolt group 17 adopts an M10*50 bolt group 17.

[0034] In one embodiment of this utility model, the fixing member 9 is a fixing bolt, which is readily available and has a good effect.

[0035] In one embodiment of this utility model, the spring assembly 3 is installed on the bent surface of the bracket 4, which can save space and also achieve the ultimate in thickness direction, so that the space occupied by the tensioning device 13 is minimized. It is compactly designed in the height and width directions, and the overall thickness of the tensioning device 13 is almost the same as that of the limit switch 10, which improves applicability.

[0036] In one embodiment of this utility model, the bracket 4 is made of sheet metal material and bending forming process, and is the main structure of the tensioning device 13. It has a compact structure and no other accessories, and the structure is extremely simple.

[0037] In one embodiment of this utility model, a rope-blocking shaft 20 is also installed on the bracket 4, which can ensure that the wire rope 12 will not come off the rope wheel 14, thus ensuring the safety of elevator operation. It can also adjust the position of the wire rope 12, maintain the correct tension of the wire rope 12, reduce the wear of the wire rope 12, and extend the service life of the wire rope 12 and the rope wheel 14.

[0038] In one embodiment of this utility model, the upper end of the spring rod 6 is provided with a fan-shaped protrusion. The fan-shaped protrusion is connected to the compression spring 8 through a flat washer 22. The flat washer 22 can limit the compression spring 8 and serve as the force-bearing surface of the compression spring 8. When the bracket 4 is lifted, the bracket 4 separates from the base frame 5 and continuously increases the compression of the compression spring 8 until the compression spring 8 is compressed to the design value and the tension is at the design maximum state. If the wire rope 12 elongates due to aging or environmental problems, the bracket 4 will move downward under the action of the spring force until the limit switch 10 touches the base frame 5 and then cuts off the power. At this time, it is only necessary to readjust the length of the wire rope 12 to raise the tensioning device 13 to the design height.

[0039] It should be noted that, in this utility model, unless otherwise explicitly specified and limited, the terms "fixed," "set," etc., should be interpreted broadly. For example, they can refer to welded connections, bolted connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A wire rope tensioning device, comprising a protective cover, a rope pulley assembly, a spring assembly, a bracket, a base frame, and a limit switch, wherein the bracket is mounted on the base frame, and the protective cover, rope pulley assembly, spring assembly, and limit switch are all mounted on the bracket, characterized in that, The spring assembly includes a spring rod, a spring seat, and a compression spring. A guide hole is provided on the bracket. The lower end of the spring rod passes through the guide hole and is locked with a fastener. The spring seat and the compression spring are installed sequentially from top to bottom around the spring rod. The width of the spring rod is similar to the inner diameter of the compression spring.

2. The wire rope tensioning device according to claim 1, characterized in that, The pulley assembly includes a pulley, a retaining ring for the hole, a bearing, a spacer sleeve, and a bolt assembly.

3. The wire rope tensioning device according to claim 1 or 2, characterized in that, The spring assembly is mounted on the bent surface of the bracket.

4. The wire rope tensioning device according to claim 1, characterized in that, The bracket is also equipped with a rope-blocking shaft.

5. The wire rope tensioning device according to claim 1 or 4, characterized in that, The upper end of the spring rod is provided with a fan-shaped protrusion, which is connected to the compression spring through a flat washer.

6. The wire rope tensioning device according to claim 1, characterized in that, The protective cover covers the pulley assembly.

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