A speed limiting mechanism for an elevator car

Abstract

The utility model relates to a kind of speed limiting mechanism for elevator car.The present speed limiting mechanism maintenance is troublesome.The utility model includes the speed governor with speed limiting wheel, the tensioner with tension pulley and steel wire rope, speed governor and tensioner are respectively set at the both ends of elevator shaft, tensioner is installed at preset station by adjusting assembly, by increasing the distance between tensioner and speed governor to implement tensioning operation to steel wire rope, to limit the relative sliding between steel wire rope and speed limiting wheel.Adjusting assembly is set between tensioner and preset station, so that the distance between tensioner and speed governor is adjustable, both by increasing the distance between tensioner and speed governor to offset the length variation of steel wire rope, ensure that steel wire rope is always in the state of tight and have larger friction force between speed limiting wheel, improve the limiting effect of speed governor to car, ensure car running safety, also effectively simplify operation, convenient maintenance, improve use experience.

Description

Technical Field

[0001] This utility model relates to the field of elevators, specifically to a speed limiting mechanism. Background Technology

[0002] The existing elevator includes a car, a drive mechanism, and a speed limiting mechanism. Both the drive mechanism and the speed limiting mechanism are laid along the hoistway. Driven by the drive mechanism, the car moves up and down the hoistway to transport passengers and goods. The speed limiting mechanism detects the car's speed and decelerates the car if it exceeds the speed limit. The speed limiting mechanism includes a speed governor with a speed limiting wheel located at the top of the hoistway, a tensioning wheel with a tensioning wheel located at the bottom of the hoistway, and a steel wire rope wrapped between the speed governor and the tensioning wheel. The two ends of the steel wire rope are wrapped around the speed governor and the tensioning wheel respectively and then fastened to the car by locking clips. The tensioning wheel pulls the steel wire rope downwards, making it tightly fitted against the speed governor. By increasing the rotational resistance of the speed governor, the movement of the steel wire rope is hindered, thereby limiting the car's speed and ensuring safe operation.

[0003] Because the speed governor and tensioner are fixed at the end of the hoistway, the distance between the speed governor wheel and the tensioner wheel remains constant. After prolonged tension, the wire rope will undergo tensile deformation, causing it to slack due to increased length. This reduces the friction between the wire rope and the speed governor wheel, diminishing the speed-limiting effect on the car and potentially leading to ineffective car deceleration, posing a safety hazard. Regular tightening and loosening of the wire rope is also required, necessitating the release of the locking mechanism. This frequent disassembly and reassembly of the locking mechanism increases maintenance difficulty and cost, is time-consuming and labor-intensive, and negatively impacts the user experience. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a speed limiting mechanism for elevator cars. An adjustment component is set between the tensioner and the preset position, making the distance between the tensioner and the speed limiter adjustable. This not only matches the length of the wire rope, ensuring that the wire rope is always taut and improving the speed limiter's limiting effect on the car, but also effectively simplifies operation, facilitates maintenance, and enhances the user experience.

[0005] This utility model is achieved through the following method: a speed limiting mechanism for an elevator car, comprising a speed limiter with a speed limiting wheel, a tensioner with a tensioning wheel, and an annular steel wire rope wrapped between the speed limiter and the tensioning wheel. The speed limiter and the tensioner are respectively located at both ends of the elevator shaft, with the steel wire rope arranged along the car's vertical path. The tensioner is installed at a preset position via an adjustment component. By increasing the distance between the tensioner and the speed limiter, the steel wire rope is tensioned, thus limiting relative slippage between the steel wire rope and the speed limiter. The adjustment component between the tensioner and the preset position allows for adjustment of the distance between them. This increases the distance to offset changes in the length of the steel wire rope, ensuring the rope remains taut and has significant friction with the speed limiter, improving the speed limiter's limiting effect on the car, ensuring safe car operation, and also simplifying operation, facilitating maintenance, and improving the user experience.

[0006] Preferably, the adjusting assembly includes a screw and a fastener. The fixed end of the screw is fixed to a preset position, and the adjusting end is inserted into the tensioner and locked in place by the fastener. The adjusting assembly pulls the tensioner toward the preset position. One end of the screw is fixed to the preset position to ensure a fixed position, while the other end is inserted into the tensioner and secured by the fastener. The position of the tensioner on the screw is controlled by adjusting the position of the fastener, and the tension of the wire rope is adjusted by adjusting the distance between the tensioner and the preset position. The tension of the wire rope can be adjusted simply by rotating the fastener, effectively simplifying the structure and facilitating operation.

[0007] Preferably, the tensioner includes a housing with a mounting hole on its bottom wall. The fastener includes an upper nut positioned above the mounting hole. The adjusting end of the screw passes through the mounting hole from bottom to top and connects to the upper nut. The upper nut is screwed downwards along the screw and pushes the housing towards a preset position. The screw pulls the housing through the upper nut, making the distance between the tensioner and the preset position adjustable, thus facilitating the tensioning of the wire rope. The upper nut, screwed to the screw, overlaps the periphery of the mounting hole, located on the side of the mounting hole facing away from the preset position. This ensures the upper nut abuts against the periphery of the mounting hole and prevents the tensioner from shifting towards the speed limiter, ensuring the distance between the speed limiter and the tensioning wheel does not decrease.

[0008] Preferably, the fastener includes a lower nut positioned below the mounting hole and screwed to the screw rod. When the housing is pushed into place by the upper nut, the lower nut rotates towards the upper nut and clamps the periphery of the mounting hole, thus fixing the housing to the screw rod in a fixed position. The lower nut is positioned on the side of the mounting hole facing the preset work position. Both the lower and upper nuts are screwed to the screw rod and cooperate to clamp the periphery of the mounting hole, fixing the relative position between the screw rod and the housing, and providing tension for the wire rope. In addition, the lower nut also provides vertical support for the housing, ensuring that the tensioner remains suspended above the preset work position when detached from the wire rope, facilitating the assembly of the tensioning wheel and the wire rope.

[0009] Preferably, the adjusting assembly includes an annular washer sleeved on the screw and held between the lower nut and the periphery of the mounting hole, thereby increasing the contact area between the lower nut and the housing. The annular washer, held between the lower nut and the periphery of the mounting hole, allows the weight of the housing to be transferred to the lower nut via the annular washer, increasing the contact area between the lower nut and the periphery of the mounting hole and protecting the periphery of the mounting hole from twisting deformation due to localized concentrated stress.

[0010] Preferably, the bottom of the housing, above the mounting hole, has a movable space for the extension and retraction of the screw tip. The bottom of the housing cavity is left unoccupied, providing this space for the screw tip to extend and retract, thereby increasing the lifting and lowering range of the tensioner to ensure effective tensioning of the wire rope.

[0011] Preferably, there are two screws symmetrically placed on both sides of the bottom wall of the housing. The screws are installed on both sides of the bottom of the tensioner through corresponding adjustment components. The symmetrical placement of the screws ensures that the force is evenly distributed on both sides of the bottom of the housing, thereby maintaining the posture of the housing, and also improves the connection reliability, ensuring that the tensioner can be fixed at the preset position.

[0012] Preferably, a fixing hole is provided at the preset work position, and the fixing end of the screw is fixedly locked to the fixing hole. The screw is screwed and locked to the fixing hole at the preset work position to ensure that the tensioner is fixed in position and cooperates with the speed limiter to tighten the wire rope.

[0013] Preferably, the tensioner includes a tensioning member disposed on the top of the housing and capable of being raised and lowered. The top of the housing is provided with a guide plate with a guide hole. The tensioning member has a tensioning wheel at its top and extends downward through the guide hole and spring at its bottom before being fixed to a limiting plate. This allows the spring to use its own reset preload to drive the tensioning wheel downward through the tensioning member, pulling the wire rope downward. The tensioning member passes through the guide plate and is installed in cooperation with the spring. The spring's reset preload provides the pulling force on the wire rope. The guide plate can move synchronously with the housing, allowing the spring to use its elasticity to counteract excessive displacement of the guide plate, thereby ensuring that the tension force of the wire rope remains within a preset range and protecting the wire rope.

[0014] Preferably, the tensioning element includes a C-shaped connecting portion, a pull rod disposed below the connecting portion, and a wheel frame disposed above the connecting portion. The tensioning wheel is rotatably mounted on the wheel frame, and the pull rod is vertically and vertically inserted into a guide hole, so that the tensioning element pulls the tensioning wheel downward under the drive of a spring. The tensioning wheel is rotatably mounted on the connecting portion via the wheel frame, which can effectively transmit the tensioning force and ensure that the tensioning wheel can rotate freely and guide the wire rope.

[0015] Preferably, the limiting plate is provided with a limiting hole. The pull rod passes through the corresponding guide hole, the spring and the limiting hole and is screwed and locked with the fixing nut so that the spring is telescopically clamped between the limiting plate and the guide plate. The limiting plate and the guide plate cooperate to clamp the spring, which plays a positioning role for the spring and prevents the spring from shifting due to telescopic deformation. This ensures that the spring's reset preload can be effectively converted into the tension force applied to the wire rope.

[0016] Preferably, there are two pull rods symmetrically placed on both sides of the connecting part, and each pull rod is equipped with a spring to ensure that the connecting part is subjected to uniform force, which not only effectively improves the tension force, but also allows the wire rope to still be tensioned even if either spring fails.

[0017] The beneficial effects of this utility model are as follows: By setting an adjustment component between the tensioner and the preset station, the distance between the tensioner and the speed limiter can be adjusted. This not only counteracts the changes in the length of the wire rope by increasing the distance between the tensioner and the speed limiter, ensuring that the wire rope is always taut and has a large friction force with the speed limiter wheel, but also improves the limiting effect of the speed limiter on the car, ensuring the safe operation of the car, but also effectively simplifies operation, facilitates maintenance, and improves the user experience. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the assembly structure of the speed limiting mechanism;

[0019] Figure 2 This is a schematic diagram of the assembly structure when the tensioner is in the high position.

[0020] Figure 3 This is a schematic diagram of the assembly structure when the tensioner is in the low position.

[0021] In the diagram: 1. Speed ​​limiter, 2. Speed ​​limiter wheel, 3. Tensioner wheel, 4. Tensioner, 5. Wire rope, 6. Screw, 7. Upper nut, 8. Lower nut, 9. Annular washer, 10. Housing, 11. Guide plate, 12. Spring, 13. Limiting plate, 14. Pull rod, 15. Connecting part, 16. Wheel frame. Detailed Implementation

[0022] The essential features of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 The elevator car speed limiting mechanism shown comprises a speed limiter 1 with a speed limiting wheel 2, a tensioner 4 with a tensioning wheel 3, and an annular steel wire rope 5 wrapped between the speed limiter 2 and the tensioning wheel 3. The speed limiter 1 and the tensioner 4 are respectively set at both ends of the elevator shaft so that the steel wire rope 5 is set along the car's lifting path. The tensioner 4 is installed at a preset position through a telescopic adjustment component. The steel wire rope 5 is tensioned by increasing the distance between the tensioner 4 and the speed limiter 1 to limit relative slippage between the steel wire rope 5 and the speed limiter 2. An adjustment component is installed between the tensioner 4 and the preset station, making the distance between the tensioner 4 and the speed limiter 1 adjustable. This not only counteracts the change in the length of the wire rope 5 by increasing the distance between the tensioner 4 and the speed limiter 1, ensuring that the wire rope 5 is always taut and has a large friction with the speed limiter wheel 2, but also improves the limiting effect of the speed limiter 1 on the car, ensuring the safe operation of the car, and also effectively simplifies operation, facilitates maintenance, and improves the user experience.

[0024] In actual operation, the wire rope 5 is long and thin, with its two ends passing over the tension wheel 3 and the speed limiter wheel 2 respectively, and then stacked and fastened to the car by fasteners. The tension wheel 3 applies tension force to the wire rope 5 to tighten it, ensuring that the wire rope 5 is taut and tightly fitted with the periphery of the speed limiter wheel 2. By increasing the friction between the wire rope 5 and the periphery of the speed limiter wheel 2, the two are ensured to run synchronously. The rotational resistance of the speed limiter wheel 2 is transmitted to the car through the wire rope 5, which limits the speed of the car and ensures that the car runs within the preset speed, thereby improving safety and reliability.

[0025] In actual operation, in order to increase the tension of the wire rope 5, unlike the existing methods of adjusting the length of the wire rope 5, this utility model achieves the purpose of tightening the wire rope 5 by adjusting the distance between the tension wheel 3 and the speed limiting wheel 2, thereby increasing the friction between the wire rope 5 and the speed limiting wheel 2 to ensure synchronous rotation, and then using the speed limiter 1 to limit the speed of the car.

[0026] In actual operation, the adjusting component includes a screw 6 and fasteners. The fixed end of the screw 6 is fixed at a preset position, and the adjusting end is inserted into the tensioner 4 and locked in place by the fasteners. The adjusting component pulls the tensioner 4 toward the preset position. The fasteners include an upper nut 7 and a lower nut 8. The preset position is formed at the bottom of the well. During installation, the bottom end of the screw 6 is screwed into the fixed hole at the preset position, ensuring that the screw 6 remains vertical and is fixed to the bottom of the well. The top of the screw 6 passes through the lower nut 8, the annular washer 9, the mounting hole, and the upper nut 7 from bottom to top. Both the upper nut 7 and the lower nut 8 are screwed to the screw 6 and clamp and position the bottom wall of the housing 10. After installation, the housing 10 is clamped and positioned by the upper nut 7 and the lower nut 8, and the distance between the housing 10 and the preset position is adjustable, thereby achieving adjustable distance between the speed limiting wheel 2 and the tensioning wheel 3.

[0027] In actual operation, the user regularly checks the wire rope 5 and adjusts the adjusting components according to its tension to ensure that the wire rope 5 is always taut. When the wire rope 5 becomes slack due to long-term elongation under stress, firstly, the lower nut 8 is screwed downwards along the axis of the screw rod 6 to provide space for the housing 10 to move downwards; then, the upper nut 7 is screwed downwards along the axis of the screw rod 6. During its downward movement, the upper nut 7 pushes against the periphery of the mounting hole and drives the housing 10 downwards, allowing the tensioning wheel 3 to move downwards under the drive of the housing 10 and increase the distance between it and the speed limiting wheel 2, thereby tautning the wire rope 5; finally, the lower nut 8 is screwed upwards along the axis of the screw rod 6 and, together with the upper nut 7, clamps the periphery of the mounting hole, thus positioning the housing 10. Through the above steps, the tensioner 4 is switched from a high position far from the preset position to a low position close to the preset position (e.g., Figure 2 and 3 As shown in the figure, this causes the wire rope 5 to be tightened and tightly fitted with the speed limiter wheel 2.

[0028] In actual operation, the tensioner 4 includes a tensioning member that is mounted on the top of the housing 10 and can be raised and lowered. The top of the housing 10 is provided with a guide plate 11 with a guide hole. The tensioning member has a tensioning wheel 3 mounted on its top, and its bottom passes downward through the guide hole and spring 12 before being fixed to a limiting plate 13. This allows the spring 12 to use its own reset preload to drive the tensioning wheel 3 downward through the tensioner to pull the wire rope 5. A spring 12 is provided between the tensioning member and the guide plate 11 of the housing 10. The spring 12 can use its own deformation to counteract the excessive downward movement of the tensioner 4, thereby preventing the wire rope 5 from being stretched, deformed, or damaged due to the excessive downward movement of the tensioner 4. The spring 12 eliminates the excessive displacement of the tensioner 4 through its own deformation, ensuring that the tension of the wire rope 5 remains within a preset range. This ensures that the wire rope 5 remains taut and also protects the wire rope 5. In addition, the spring 12 can allow the housing 10 to be adjusted a large distance at a time through compression deformation, and can eliminate the slow stretching changes of the wire rope 5 during use by slow reset, effectively reducing the adjustment frequency of the adjustment component, increasing the time between two adjacent adjustment operations, and facilitating maintenance.

[0029] In actual operation, the tensioner 4 includes a housing 10, the bottom wall of which has a mounting hole. The fastener includes an upper nut 7 positioned above the mounting hole and a lower nut 8 positioned below the mounting hole and screwed to the screw rod 6. The adjusting end of the screw rod 6 passes through the mounting hole from bottom to top and connects to the upper nut 7. The upper nut 7 is screwed downwards along the screw rod 6 and pushes the housing 10 toward a preset position. When the housing 10 moves into place under the push of the upper nut 7, the lower nut 8 rotates toward the upper nut 7 and clamps the periphery of the mounting hole, thereby fixing the housing 10 to the screw rod 6 for positioning. Both the upper nut 7 and the lower nut 8 are hexagonal flange nuts, which improve positioning reliability by increasing the contact area with the housing 10.

[0030] In actual operation, the adjusting component includes an annular washer 9 sleeved on the screw 6 and held between the lower nut 8 and the periphery of the mounting hole, thereby increasing the contact area between the lower nut 8 and the housing 10. By setting the annular washer 9 to increase the contact area between the lower nut 8 and the periphery of the mounting hole, the reliability of the abutment positioning is improved. In addition, the annular washer 9 can also be set between the upper nut 7 and the periphery of the mounting hole, increasing the contact area when the housing 10 is pulled by the upper nut 7, thus improving the pulling reliability.

[0031] In actual operation, the bottom of the housing 10, above the mounting hole, has a movable space for the extension and retraction of the top end of the screw 6. The height of the movable space at the bottom of the housing 10 should meet the distance required for the lifting and lowering adjustment of the housing 10, thereby preventing the top end of the screw 6 from being unable to be inserted into the housing 10 due to contact with the internal components of the housing 10. When the screw 6 is inserted into the housing 10 to the upper limit, it is necessary to shorten the length of the wire rope 5 by disassembling the fastener. During this process, the tensioner 4 is moved upward and reset so that the housing 10 regains the movable space for the screw 6 to be inserted, thereby extending the time for disassembling the fastener.

[0032] In actual operation, there are two screws 6, which are symmetrically placed on both sides of the bottom wall of the housing 10. The screws 6 are installed on both sides of the bottom of the tensioner 4 through corresponding adjustment components. The screws 6 cooperate to position the housing 10. The upper nut 7 on the screw 6 rotates synchronously and pulls the tensioning wheel 3 downward to ensure that the tensioner 4 always maintains a vertical posture and pulls the wire rope 5 stably, preventing the wire rope 5 from coming off due to the deviation of the tensioning wheel 3.

[0033] In actual operation, the tensioning component includes a C-shaped connecting part 15, a pull rod 14 disposed below the connecting part 15, and a wheel frame 16 disposed above the connecting part 15. The tensioning wheel 3 is rotatably mounted on the wheel frame 16, and the pull rod 14 is vertically inserted through the guide hole so that the tensioning component pulls the tensioning wheel 3 downward under the drive of the spring 12. The tensioning component is a split structure, including the independently machined and assembled connecting part 15, pull rod 14, and wheel frame 16. The pull rod 14 is disposed below the connecting part 15 and is fixed to the limiting plate 13 after passing downward through the guide plate 11 and the spring 12, ensuring that the spring 12 sleeved on the pull rod 14 can be clamped and fixed by the guide plate 11 and the limiting plate 13, playing the role of buffering, storing, and transmitting the pulling force, and ensuring that the wire rope 5 maintains the preset tension for a long time.

[0034] In actual operation, the limiting plate 13 is provided with a limiting hole. The pull rod 14 passes through the corresponding guide hole, the spring 12, and the limiting hole, and is then screwed and locked with the fixing nut, so that the spring 12 is telescopically clamped between the limiting plate 13 and the guide plate 11; or, there are two pull rods 14, symmetrically placed on both sides of the connecting part 15. The tensioning member can move up and down relative to the guide plate 11 under the drive of the spring 12, ensuring that the tension of the wire rope 5 is balanced with the reset preload of the spring 12, effectively eliminating the influence of the change in distance between the housing 10 and the speed limiting wheel 2 on the tension of the wire rope 5.

Claims

1. A speed limiting mechanism for an elevator car, comprising a speed limiter (1) with a speed limiting wheel (2), a tensioner (4) with a tensioning wheel (3), and an annular steel wire rope (5) wrapped between the speed limiting wheel (2) and the tensioning wheel (3), wherein the speed limiter (1) and the tensioner (4) are respectively disposed at both ends of the elevator shaft and the steel wire rope (5) is arranged along the car's lifting path, characterized in that, The tensioner (4) is installed at a preset position by a telescopic adjustment component. The wire rope (5) is tensioned by increasing the distance between the tensioner (4) and the speed limiter (1) to limit relative slippage between the wire rope (5) and the speed limiter wheel (2).

2. The speed limiting mechanism for an elevator car according to claim 1, characterized in that, The adjustment component includes a screw (6) and a fastener. The fixed end of the screw (6) is fixed at a preset position, and the adjustment end is inserted into the tensioner (4) and locked by the fastener. The adjustment component pulls the tensioner (4) toward the preset position.

3. The speed limiting mechanism for an elevator car according to claim 2, characterized in that, The tensioner (4) includes a housing (10), the bottom wall of which is provided with a mounting hole. The fastener includes an upper nut (7) located above the mounting hole. The adjusting end of the screw (6) passes through the mounting hole from bottom to top and is connected to the upper nut (7). The upper nut (7) is screwed down along the screw (6) and pushes the housing (10) toward the preset position.

4. The speed limiting mechanism for an elevator car according to claim 3, characterized in that, The fastener includes a lower nut (8) located below the mounting hole and screwed to the screw (6). When the housing (10) moves into place under the push of the upper nut (7), the lower nut (8) rotates toward the upper nut (7) and clamps the periphery of the mounting hole so that the housing (10) is fixedly positioned to the screw (6).

5. A speed limiting mechanism for an elevator car according to claim 4, characterized in that, The adjustment assembly includes an annular washer (9) sleeved on the screw (6) and held by the lower nut (8) and the periphery of the mounting hole to increase the contact area between the lower nut (8) and the housing (10).

6. A speed limiting mechanism for an elevator car according to claim 3, characterized in that, The bottom of the housing (10) above the mounting hole has a movable space for the top end of the screw (6) to extend and retract.

7. A speed limiting mechanism for an elevator car according to claim 2, characterized in that, The screws (6) are two in number and symmetrically placed on both sides of the bottom wall of the housing (10). The screws (6) are installed on both sides of the bottom of the tensioner (4) through corresponding adjustment components; or, a fixing hole is opened at the preset working position. The fixed end of the screw (6) is fixedly locked to the fixed hole.

8. A speed limiting mechanism for an elevator car according to any one of claims 1-7, characterized in that, The tensioner (4) includes a tensioning member that is set on the top of the housing (10) and can be raised and lowered. The top of the housing (10) is provided with a guide plate (11) with a guide hole. The tensioning member is provided with a tensioning wheel (3) on the top and passes through the guide hole and spring (12) at the bottom and is fixed to the limiting plate (13) so that the spring (12) uses its own reset preload force to drive the tensioning wheel (3) to pull the wire rope (5) downward through the tensioning member.

9. A speed limiting mechanism for an elevator car according to claim 8, characterized in that, The tensioning member includes a connecting part (15) with a cross-section in the shape of an inverted triangle, a pull rod (14) disposed below the connecting part (15), and a wheel frame (16) disposed above the connecting part (15). The tensioning wheel (3) is rotatably mounted on the wheel frame (16), and the pull rod (14) is vertically inserted through the guide hole so that the tensioning member pulls the tensioning wheel (3) downward under the drive of the spring (12).

10. A speed limiting mechanism for an elevator car according to claim 9, characterized in that, The limiting plate (13) is provided with mounting holes. The pull rod (14) passes through the corresponding guide hole, the spring (12) and the mounting hole and is screwed and locked with the fixing nut so that the spring (12) is telescopically clamped between the limiting plate (13) and the guide plate (11); or, the pull rod (14) is two rods and is symmetrically placed on both sides of the connecting part (15).

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