Cam double-swing-rod speed limiter with tensioning device

Abstract

The utility model relates to a cam double-swing-rod speed limiter with a tensioning device, which comprises a car frame, a steel wire rope vertically arranged in a hoistway, a pair of safety tongs arranged on the car frame and a speed limiter, and the speed limiter is driven by the steel wire rope. According to the cam double-swing-rod speed governor with the tensioning device, the double-trigger-point tensioning device can effectively avoid misoperation or failure caused by abnormal tension of the steel wire rope, the reliability of the speed governor is improved, the speed governor is directly installed on the car frame, and therefore the length of the steel wire rope is shortened, and the safety of the car frame is improved. The response speed of the safety tongs is remarkably increased, the elevator operation safety is effectively enhanced, the structure is simplified through the integrated design of the device, and the manufacturing cost and the installation cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to elevator mechanical speed limiting protection device technical field, especially a cam double swing rod speed limiter with tensioning device. BACKGROUND

[0002] In the prior art, the elevator speed limiter is an important device to ensure the safe operation of the elevator, which triggers the action of the safety tongs when the elevator operating speed exceeds the set value, so as to stop the operation of the elevator and prevent falling accidents.

[0003] The traditional elevator speed limiter is usually installed in the machine room or the top of the shaft and connected with the car through a steel wire rope. This installation method has some disadvantages: first, because of the long distance between the speed limiter and the car, the steel wire rope is long, which leads to a long signal transmission time, and the elasticity of the steel wire rope may cause the safety tongs pulling mechanism connected to the steel wire rope to fail to act in time, resulting in a relatively slow response speed of the safety tongs, which may increase the risk of accidents in the case of elevator overspeed; second, the long steel wire rope increases the material cost, and the installation process is also more complex, and the tensioning device at the lower end needs to occupy a large space, increasing the installation cost.

[0004] For example, the elevator speed limiter car frame mounting structure with the application number CN202223396965.6, the limiting track is connected with the speed limiter, the limiting track is installed on the elevator car frame, the speed limiter is arranged between the limiting tracks, the speed limiter is connected with the steel wire rope tensioning device through the speed limiter steel wire rope, the speed limiter is connected with the safety tongs connecting rod, the safety tongs connecting rod is connected with the safety tongs, the above-mentioned scheme solves the problem of slow response speed of the safety tongs, but still has the following disadvantages: it relies on the tensioning device to maintain the tension of the steel wire rope, when the tensioning device fails, the speed limiter may not work normally, which poses a safety hazard. UTILITY MODEL CONTENTS

[0005] In order to solve the above problems, the utility model provides a more rapid and reliable cam double swing rod speed limiter with tensioning device.

[0006] In order to achieve the above purpose, the utility model designs a cam double swing rod speed limiter with tensioning device, which comprises a car frame, a steel wire rope vertically arranged in the shaft, a safety tongs and a speed limiter installed on the car frame, the speed limiter is driven by the steel wire rope, and further comprises:

[0007] Pulling rod, connecting the pulling arm of the speed limiter and the safety tongs, for responding to the action of the speed limiter when the elevator runs at high speed to pull the pulling arm;

[0008] Tensioning device, connected with the steel wire rope, configured to produce swing under the action of the tension of the steel wire rope;

[0009] The tension stroke switch is connected in series to the elevator safety circuit.

[0010] The tension device is provided with two stroke trigger points, which are used to trigger the tension stroke switch when the tension device is turned upward and downward by a predetermined distance.

[0011] Preferably, the tension device comprises a first support, a pivot and an arm, one end of the steel wire rope is connected to the arm, the arm is rotatably mounted on the first support around the pivot; the arm is provided with a counterweight or a tension spring to apply force to the arm to keep the arm in a predetermined position.

[0012] Preferably, the counterweight is a counterweight or a tension spring.

[0013] Preferably, the tension device comprises a second support, a first connecting rod, a second connecting rod, a fixed shaft, a first movable shaft and a second movable shaft, the second support defines a slot space, and the fixed shaft is fixed in the slot space; the slot wall of the slot space is provided with two guide grooves, the first movable shaft is slidingly connected in the guide grooves and connected with the fixed shaft through a tension spring; the first connecting rod connects the fixed shaft and the second movable shaft, and the second connecting rod connects the first movable shaft and the second movable shaft; one end of the steel wire rope is connected to the second movable shaft.

[0014] Preferably, the speed limiter comprises a housing, a first shaft and a first swing lever are arranged in the housing, a rope wheel, a cam and a ratchet wheel are rotatably mounted on the first shaft and rotate synchronously, the middle part of the first swing lever is rotatably mounted on the first shaft; one end of the first swing lever is connected with a pull rod, the other end is provided with a second shaft, and a second swing arm is rotatably mounted on the second shaft; one end of the second swing arm is provided with a pressure wheel, and a spring is arranged to pull the second swing arm to make the pressure wheel abut against the cam surface of the cam; the other end of the second swing arm is provided with a pawl matched with the ratchet wheel.

[0015] Preferably, the first swing lever is a frame structure capable of accommodating the rope wheel, the cam, the ratchet wheel and the second swing arm.

[0016] Preferably, at least one tensioning wheel is further arranged in the housing, and the steel wire rope is wound around the rope wheel and the tensioning wheel.

[0017] Preferably, a first limiting support and a reset spring are further arranged in the shell above the first swing rod, the pull rod passes through the first limiting support, and coaxial holes are respectively arranged in the first limiting support and the pull rod; a top rod cap and a retreat stop are arranged on the pull rod, the top rod cap is located at one end of the pull rod passing through the first limiting support, the retreat stop is located between the two holes, and the diameters of the top rod cap and the retreat stop are greater than the diameter of the hole; the reset spring is sleeved on the pull rod, and the two ends of the reset spring sleeve abut against the first limiting support and the retreat stop respectively; an electrical switch is arranged near the top rod cap, and when the pull rod pulls the pull arm of the safety clamp, the top rod cap triggers the electrical switch.

[0018] Preferably, a second limiting support is further arranged in the shell below the first swing rod, for limiting the initial position of the first swing rod.

[0019] Preferably, an electric drive device is further arranged, connected with the second swing rod, for driving the second swing rod to swing to enable the pawl to engage with the ratchet wheel.

[0020] The cam double-swing-rod speed limiter with the tensioning device can effectively avoid misoperation or failure caused by abnormal tension of the steel wire rope, improve the reliability of the speed limiter, shorten the length of the steel wire rope by directly installing the speed limiter on the car frame, significantly improve the response speed of the safety clamp, effectively enhance the safety of elevator operation, and simplify the structure through integrated design of the device, and reduce manufacturing cost and installation cost. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic view of the cam double-swing-rod speed limiter with the tensioning device and the safety clamp linkage provided by the embodiment of the application;

[0022] Figure 2 is Figure 1 an enlarged schematic view of A in FIG.

[0023] Figure 3 is a schematic view of the cam double-swing-rod speed limiter with the tensioning device provided by the embodiment of the application Figure 1 ;

[0024] Figure 4 is a schematic view of the cam double-swing-rod speed limiter with the tensioning device provided by the embodiment of the application Figure 2 ;

[0025] Figure 5 is a schematic view of the linkage of the first swing rod and the second swing rod provided by the embodiment of the application;

[0026] Figure 6is a schematic diagram of a tensioning device provided by an embodiment of the application;

[0027] Figure 7 is a schematic diagram of a tensioning device provided by another embodiment of the application;

[0028] Figure 8 is a schematic diagram of a rope wheel and tensioning wheel linkage provided by an embodiment of the application.

[0029] Wherein: the car frame 10, the steel wire rope 20, the rope head seat 21, the safety clamp 30, the lifting arm 31, the speed limiter 40, the shell 41, the hole 41a, the first limiting support 411, the reset spring 412, the second limiting support 413, the first shaft 42, the first swing lever 43, the rope wheel 44, the cam 45, the ratchet wheel 46, the second shaft 47, the second swing lever 48, the pressure wheel 481, the spring 482, the pawl 483, the tensioning wheel 49, the third shaft 491, the lifting rod 50, the top rod cap 51, the retreat stop 52, the electrical switch 53, the first mounting support 531, the tensioning device 60, the stroke trigger point 60a, the first support 61, the pivot 62, the fourth mounting support 621, the swing arm 63, the balancing piece 64, the tensioning stroke switch 70, the third mounting support 71, the second support 80, the first connecting rod 81, the second connecting rod 82, the fixed shaft 83, the first moving shaft 84, the second moving shaft 85, the slot space 86, the guide slot 87, the electric drive device 90, the second mounting support 91, the top rod 92. DETAILED DESCRIPTION

[0030] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0031] As Figures 1 to 8 shown, the cam double swing lever speed limiter with a tensioning device described in the embodiment includes the car frame 10, the steel wire rope 20 vertically arranged in the shaft, the safety clamp 30 and the speed limiter 40 installed on the car frame 10, and the speed limiter 40 is driven by the steel wire rope 20. When the elevator is overspeed, the speed limiter triggers the brake operation of the safety clamp to ensure that the elevator brakes in time. In specific implementation, the safety clamp 30 is installed on both sides of the bottom of the car frame 10, and the speed limiter 40 is installed on the top of the car frame 10. The position arrangement of the speed limiter and the safety clamp ensures that they move synchronously with the elevator car, that is, the car frame 10 in the elevator shaft.

[0032] The speed limiting device further includes:

[0033] The pull rod 50 is connected to the speed limiter 40 and the pull arm 31 of the safety gear 30, and is used to pull the pull arm 31 in response to the action of the speed limiter 40 when the elevator is overspeeding. When the elevator is overspeeding, the speed limiter 40 is driven by the driving force of the steel wire rope 20 to drive the pull rod 50, and then drive the pull arm 31, activate the safety gear 30, and realize the braking function. The safety gear 30 used in the embodiment can be a mature existing product, and the pull arm 31 thereof is connected to the pull rod 50 through a hinge, thereby ensuring the reliability and accuracy of the action.

[0034] The tensioning device 60 is connected to the steel wire rope 20 and is configured to swing under the action of the tension of the steel wire rope 20. In the embodiment, the main function of the tensioning device 60 is to maintain the appropriate tension of the steel wire rope 20, so as to prevent the abnormal tension of the steel wire rope 02 from causing misoperation or failure, that is, to improve the reliability of the speed limiter 40 and ensure that the elevator can still work stably in abnormal conditions.

[0035] The tension stroke switch 70 is connected in series to the safety circuit of the elevator. The tensioning device 60 is provided with two stroke trigger points 60a, which are respectively used to trigger the tension stroke switch 70 when the tensioning device 60 swings upward by a predetermined distance and downward by a predetermined distance. When the tension of the steel wire rope is abnormal, the tensioning device 60 swings to a predetermined position, and the tension stroke switch 70 is triggered, thereby cutting off the safety circuit of the elevator.

[0036] Specifically, the two stroke trigger points 60a of the tensioning device 60 are respectively used to trigger the tension stroke switch 70 when the tensioning device 60 swings upward and downward by a predetermined distance. This double trigger point design enables the tensioning device to effectively respond and trigger the safety circuit when the tension of the steel wire rope 20 is abnormal, thereby avoiding misoperation or failure caused by a single trigger point. That is, no matter whether the steel wire rope 20 is too loose or too tight, the swing of the tensioning device 60 can accurately reflect the change in tension, and when the tension exceeds the preset range, the switch can be triggered through any one of the stroke trigger points 60a, thereby ensuring that the speed limiter 40 can be started in time when the elevator is overspeeding, and thus ensuring safety.

[0037] In addition, the speed limiter 40 provided in the embodiment is installed on the car frame 10 together with the safety gear 30, and the safety gear 30 is rigidly connected to the speed limiter 40 through the pull rod 50, so that the transmission path is shorter, and thus the safety gear 30 can respond more quickly to the overspeeding of the elevator and complete the braking action quickly. At the same time, since the speed limiter 40 moves synchronously with the car frame 10, only one-way one steel wire rope 20 needs to be arranged in the shaft, which not only simplifies the structure and reduces the complexity of the device, but also effectively reduces the overall cost of the system.

[0038] In some embodiments, as Figure 6 , Figure 8As shown, the tensioning device 60 comprises a first support 61, a pivot 62 and a swing arm 63, one end of the steel wire rope 20 is connected to the swing arm 63, and the swing arm 63 is rotatably mounted on the first support 61 around the pivot 62; the swing arm 63 is provided with a balancing member 64 for applying force to the swing arm 63 to keep the swing arm 63 in a predetermined position.

[0039] In a specific implementation, the first support 61 can be fixed on the car guide rail of the elevator car by bolts; one end of the steel wire rope 20 is fixed to the top of the hoistway, and the other end is connected to the swing arm 63 through the rope head seat 21. In this way, the tension of the steel wire rope 20 directly acts on the swing arm 63, causing the swing arm 63 to move accordingly, and the balancing member 64 is used to apply appropriate force to keep the swing arm 63 in a predetermined position, ensuring that the tension of the steel wire rope is maintained within a reasonable range, preventing the steel wire rope 20 from being too loose or too tight, thereby avoiding malfunctions or device failures caused by improper tension. In addition, the two travel trigger points 60a are connected to the pivot 62 through the fourth mounting support 621, and the tension travel switch 70 is mounted on the first support 61 through the third mounting support 71, or directly mounted on the first support 61 by fasteners, and the mounting position is close to the pivot 62. When the swing arm 63 swings due to changes in the tension of the steel wire rope 20, the pivot 62 drives the fourth mounting support 621 to rotate. Once the swing amplitude of the swing arm 63 exceeds the predetermined range, the travel trigger point 60a on one side of the swing direction will trigger the tension travel switch 70, thereby disconnecting the safety circuit of the elevator, ensuring that the device can respond quickly when the tension is abnormal, triggering the safety device in time, and preventing elevator accidents to remind the staff to repair. In this embodiment, the travel trigger point 60a is an outwardly convex structure integrated with the fourth mounting support 621.

[0040] In an embodiment, as shown in Figure 6 The balancing member 64 is a counterweight. As a balancing member 64, the counterweight has a very simple structure, is easy to implement and manufacture, does not require complex mechanical structures or precise adjustment devices, and only needs to select a counterweight with appropriate weight. It can maintain a stable force for a long time and is not easily affected by external environmental changes (such as temperature changes, wear, etc.). In another embodiment, the balancing member 64 is a tension spring. The tension spring generally has a small volume and can effectively adjust the tension in a space-limited environment, which is particularly suitable for devices that need to be miniaturized and compact in space.

[0041] In other embodiments, as shown in Figure 7 , Figure 8As shown, the tensioning device 60 includes a second support 80, a first connecting rod 81, a second connecting rod 82, a fixed shaft 83, a first movable shaft 84 and a second movable shaft 85. The second support 80 defines a slot space 86, and the fixed shaft 83 is fixed in the slot space 86. Two guide slots 87 are provided on the slot wall of the slot space 86, and the first movable shaft 84 is slidingly connected in the guide slots 87 and connected with the fixed shaft 83 through a tension spring. The first connecting rod 81 connects the fixed shaft 83 and the second movable shaft 85, and the second connecting rod 82 connects the first movable shaft 84 and the second movable shaft 85. One end of the steel wire rope 20 is connected to the second movable shaft 85.

[0042] In the embodiment, the second support 80 is fixed in the pit of the elevator shaft by bolts to provide firm support. One end of the steel wire rope 20 is fixed at the top of the shaft, and the other end is connected to the second movable shaft 85 through a rope head seat 21, so that the tension change of the steel wire rope 20 is directly transmitted to the second movable shaft 85, thereby driving the adjustment mechanism of the entire tensioning device. Specifically, the second support 80 defines a slot space 86, and the first movable shaft 84 is located in the slot and can slide in the guide slots 87. The tension spring always provides tension, forcing the angle between the first connecting rod 81 and the second connecting rod 82 to continuously decrease. When the tension of the steel wire rope 20 changes, the tension spring drives the second movable shaft 85 to slide in the guide slots 87 and drives the rope head seat 21 to move downward, thereby pulling the steel wire rope 20 to continue to move downward and continuously apply tension. The tensioning device 60 provided in the embodiment integrates multiple functional components into a slot space 86, has a simple and efficient structure design, reduces the occupied space of the device, and makes it more suitable for the limited space environment of the elevator shaft.

[0043] In some embodiments, as shown in Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 As shown, the speed limiter 40 includes a housing 41, a first shaft 42 and a first swing lever 43 are arranged in the housing 41, a rope wheel 44, a cam 45 and a ratchet wheel 46 are rotatably mounted on the first shaft 42 and rotate synchronously, a middle part of the first swing lever 43 is rotatably mounted on the first shaft 42; one end of the first swing lever 43 is connected with the pull rod 50, and the other end is provided with a second shaft 47, and a second swing lever 48 rotatably mounted on the second shaft 47; one end of the second swing lever 48 is provided with a pressure wheel 481, and a spring 482 is arranged to pull the second swing lever 48 to make the pressure wheel 481 abut against the cam surface of the cam 45; the other end of the second swing lever 48 is provided with a pawl 483 matched with the ratchet wheel 46. In the embodiment, a hole 41a is formed in the housing 41 for the steel wire rope 20 and the pull rod 40 to pass through. In the embodiment, the pawl 483 is integrally formed with the second swing lever 48.

[0044] In normal operation of the elevator, the steel wire rope 20 passes around the rope wheel 44, driving the cam 45 and the ratchet wheel 46 to rotate around the first shaft 42, at this time, one end of the second swing lever 48 is pressed against the cam surface of the cam 45 by the pressure wheel 481 under the action of the spring 482, so that the second swing lever 48 swings along the contour of the cam 45 around the second shaft 47, in this case, the pawl 483 at the other end of the second swing lever 48 does not contact the ratchet wheel 46, maintaining the normal operation state.

[0045] However, when the elevator is in downward overspeed, the rotation speed of the rope wheel 44 and the cam 45 will exceed the predetermined safety threshold, at this time, since the elastic force of the spring 482 is not enough to continue pressing the pressure wheel 481 against the cam surface of the cam 45, the angle of the second swing lever 48 changes, causing the pawl 483 to hook the ratchet wheel 46, at this time, the first swing lever 43 will rotate around the first shaft 42 under the action of inertia, driving the pull rod 50 to move upward, then the pull rod 50 pulls up the pull arm 31 of the safety hook 30, starting the brake mechanism, timely stopping the downward overspeed of the elevator, ensuring the safety of the elevator.

[0046] In some embodiments, as shown in Figure 5 the first swing lever 43 is a frame-shaped structure capable of accommodating the rope wheel 44, the cam 45, the ratchet wheel 46 and the second swing lever 48. In specific implementation, the second swing lever 48 includes a plurality of metal blocks, for example, four metal blocks are spliced together to form the general frame of the second swing lever 48, the first shaft 42 penetrates and is fixed to the first swing lever 43, and the rotation movement of the rope wheel 44, the cam 45 and the ratchet wheel 46 is realized through this shaft, so that the rope wheel 44, the cam 45 and the ratchet wheel 46 are not dispersedly arranged, but integrated in the general frame of the first swing lever 43, making the overall structure of the speed limiter 40 more compact, and avoiding the interference of unexpected factors on the moving parts, meeting the dual requirements of space and performance of modern elevators.

[0047] In some embodiments, as shown in Figure 4 , Figure 8As shown, at least one tensioner 49 is also arranged in the housing 41, and the steel wire rope 20 is wound around the sheave 44 and the tensioner 49. In particular implementations, the tensioner 49 is mounted in the housing 41 through a third shaft 491 and is arranged vertically above the sheave 44. The tensioner 49 can effectively adjust the tension of the steel wire rope 20, and ensure that the steel wire rope 20 and the sheave 44 maintain appropriate contact pressure, thereby avoiding slack or over-tightening of the steel wire rope 20. Specifically, the steel wire rope 20 is wound around the sheave 44 and passes through the tensioner 49, forming a wrap angle on the sheave 44. The wrap angle effectively increases the contact area between the steel wire rope 20 and the sheave 44, and the larger contact area significantly improves the friction between the steel wire rope 20 and the sheave 44, reducing the risk of sliding or slipping to help the steel wire rope 20 better maintain the correct tension, ensuring that the speed limiter 40 can quickly respond when the elevator is overspeed.

[0048] In addition, the arrangement of the tensioner 49 ensures that the steel wire rope 20 and the sheave 44 maintain sufficient contact pressure, so that the entire speed limiter 40 is firmly suspended on the steel wire rope 20, that is, the part of the steel wire rope 20 around the sheave 44 and the tensioner 49 connected to the top of the shaft is always in a taut state, which means that even if the tensioning device 60 at the bottom of the steel wire rope 20 fails, the speed limiter 40 can still continue to work normally, ensuring that the speed limiter 40 can still function even in the event of, for example, a tensioning device 60 or some system failure, ensuring safety when the elevator is overspeed.

[0049] In some embodiments, as shown, Figure 4 As shown, the housing 41 is further provided with a first limiting support 411 above the first swing rod 43 and a return spring 412, and the pull rod 50 passes through the first limiting support 411, and the first limiting support 411 and the pull rod 50 are respectively provided with coaxial holes; the pull rod 50 is provided with a top rod cap 51 and a stop portion 52, the top rod cap 51 is located at one end of the pull rod 50 passing through the first limiting support 411, and the stop portion 52 is located between the two holes, and the diameters of the top rod cap 51 and the stop portion 52 are greater than the diameter of the hole; the return spring 412 is sleeved on the pull rod 50, and the two ends of the return spring 412 abut against the first limiting support 411 and the stop portion 52, respectively; the top rod cap 51 is provided with an electrical switch 53 near the top rod cap 51, and when the pull rod 50 pulls the lifting arm 31 of the safety clamp 30, the top rod cap 51 triggers the electrical switch 53. In this embodiment, the hole is a waist-shaped hole to avoid motion interference between the circular motion of the first swing rod 43 and the vertical motion of the pull rod 50.

[0050] With this structure design, the reset spring 412 ensures the stable position of the pull rod 50 through the two holes by abutting between the first limiting support 411 and the stop portion 52. In the embodiment, the side of the stop portion 52 away from the first limiting support 411 is in contact with the first swing lever 43, so as to keep the first swing lever in a stable position by the elastic force of the reset spring 412, so that the reset spring 412 not only provides a reset pressure for the pull rod 50, but also ensures the accurate positioning of the first swing lever 43, effectively preventing the position deviation.

[0051] When the elevator is in downward overspeed, the elastic force of the spring 482 is not enough to continue to press the roller 481 against the cam surface of the cam 45, which causes the angle of the first swing lever 43 to change and makes the pawl 483 hook the ratchet wheel 46. At this time, the first swing lever 43 rotates around the first shaft 42 under the action of inertia, and the end of the first swing lever 43 moves upward until it contacts the stop portion 52 and compresses the reset spring 412. Then, the pull rod 50 moves upward to pull up the pull arm 31 of the safety gear 30, triggering the safety gear 30 to perform the braking operation. At the same time, before the pull rod 50 triggers the safety gear 30, the movement of the top rod cap 51 drives the electrical switch 53 to move upward synchronously, triggering the electrical switch 53 before the pull rod 50. In the embodiment, the electrical switch 53 is fixedly installed in the housing 41 through the first mounting support 531 and can communicate with the control system of the elevator.

[0052] In some embodiments, as shown in Figure 4 , the housing 41 further comprises a second limiting support 413 below the first swing lever 43 for limiting the initial position of the first swing lever 43. That is, when the elevator is in downward overspeed, the first swing lever 43 swings under the action of tension to trigger the safety gear 30. In this process, the second limiting support 413 ensures the maximum movement range of the first swing lever 43 through physical limitation, avoiding the influence of the out-of-range movement of the first swing lever 43 on the stability and accuracy of the system.

[0053] In some embodiments, as shown in Figure 4 , Figure 5 , the device further comprises an electric drive device 90 connected with the second swing lever 48 for driving the second swing lever 48 to swing to engage the pawl 483 with the ratchet wheel 46.

[0054] In the embodiment, the electric drive device 90 is installed in the shell 41 through the second mounting bracket 91, the first swing rod 43 is provided with a top rod 92 away from the end connected with the pull rod 50, and the electric drive device 90 can adopt an electromagnetic iron push-pull device to abut against the top rod 92, so as to drive the second swing rod 48 to swing around the second shaft 47, make the pawl 483 hook the ratchet wheel 46, and then make the first swing rod 43 swing around the first shaft 42. This design realizes the active triggering function of the safety hook 30. For example, when the elevator needs to be overhauled, the operator can make the electric drive device 90 drive the second swing rod 48 to move to drive the first swing rod 43 to swing and drive the pull rod 50 to move upward, and then drive the pull arm 31 to move, so as to trigger the action of the safety hook 30 and realize the shaft-out triggering of the speed limiter.

[0055] The cam double-swing-rod speed limiter with the tensioning device can effectively avoid the misoperation or failure caused by the abnormal tension of the steel wire rope, improve the reliability of the speed limiter, shorten the length of the steel wire rope by directly installing the speed limiter on the car frame, significantly improve the response speed of the safety hook, effectively enhance the safety of the elevator operation, and simplify the structure by the integrated design of the device, and reduce the manufacturing cost and the installation cost.

[0056] In the description of the utility model, it needs to be explained that the terms "vertical", "upper", "lower", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0057] In the description of the utility model, it also needs to be explained that, unless otherwise specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0058] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application have been described in detail, for the skilled in the art, it still can be modified, or for the equivalent replacement of part of the technical features of the technical solutions recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included within the scope of the present application.

Claims

1. A cam double-rocker speed limiter with a tensioning device, comprising a car frame, a steel wire rope vertically arranged in a shaft, a safety clamp installed on the car frame, and a speed limiter driven by the steel wire rope, characterized in that, Also include: Pulling rod, connecting the speed limiter and the pull arm of the safety gear, for responding to the action of the speed limiter when the elevator is overspeed operation to pull the pull arm; Tensioning device, connected with the steel wire rope, configured to be affected by the tension of the steel wire rope to produce swing; Tension stroke switch, connected to the elevator safety circuit; Wherein, the tensioning device is provided with two stroke trigger points, which are respectively used to trigger the tension stroke switch when the tensioning device swings upward and downward by a predetermined distance.

2. Cam double-rocker speed limiter with tensioning device according to claim 1, characterized in that The tensioning device comprises a first support, a pivot and a swing arm, one end of the steel wire rope is connected to the swing arm, the swing arm is rotatably mounted on the first support around the pivot; The swing arm is provided with a counterweight for applying force to the swing arm to keep the swing arm in a predetermined position.

3. Cam double-rocker speed limiter with tensioning device according to claim 2, characterized in that The counterweight is a counterweight or a tension spring.

4. The cam double-rocker speed limiter with tensioning device according to claim 1, characterized in that, The tensioning device comprises a second support, a first connecting rod, a second connecting rod, a fixed shaft, a first movable shaft and a second movable shaft, the second support defines a slot space, and the fixed shaft is fixed in the slot space; The slot wall of the slot space is provided with two guide grooves, the first movable shaft is slidingly connected in the guide groove, and the first movable shaft is connected with the fixed shaft through a tension spring; The first connecting rod connects the fixed shaft and the second movable shaft, and the second connecting rod connects the first movable shaft and the second movable shaft; One end of the steel wire rope is connected to the second movable shaft.

5. Cam double-rocker speed limiter with tensioning device according to any of claims 1-4, characterized in that The speed limiter comprises a housing, the housing is provided with a first shaft and a first swing lever, the first shaft is rotatably mounted with a synchronous rotating rope wheel, a cam and a ratchet, the middle part of the first swing lever is rotatably mounted on the first shaft; One end of the first swing lever is connected with the pulling rod, the other end is provided with a second shaft, and the middle part is rotatably mounted with a second swing arm on the second shaft; One end of the second swing arm is provided with a pressure roller, and the other end is provided with a spring for pulling the second swing arm to make the pressure roller abut against the cam surface of the cam; The other end of the second swing arm is provided with a pawl matched with the ratchet.

6. Cam double-rocker speed limiter with tensioning device according to claim 5, characterized in that The first swing lever is a frame structure capable of accommodating the rope wheel, the cam, the ratchet and the second swing arm.

7. The cam double-rocker speed limiter with tensioning device according to claim 5, characterized in that The housing is also provided with at least one tensioning wheel, and the steel wire rope is wound on the rope wheel and the tensioning wheel.

8. The cam double-rocker speed limiter with tensioning device according to claim 5, characterized in that The housing is also provided with a first limiting support above the first swing lever and a reset spring, the pulling rod passes through the first limiting support, and the first limiting support and the pulling rod are respectively provided with coaxial holes; The pulling rod is provided with a jacking rod cap and a stop portion, the jacking rod cap is located at one end of the pulling rod passing through the first limiting support, the stop portion is located between the two holes, and the diameters of the jacking rod cap and the stop portion are greater than the diameters of the holes; The reset spring is sleeved on the pulling rod, and the two ends of the reset spring sleeve abut against the first limiting support and the stop portion respectively; The jacking rod cap is provided with an electrical switch, and when the pulling rod pulls the pull arm of the safety gear, the jacking rod cap triggers the electrical switch.

9. The cam double-rocker speed limiter with tensioning device according to claim 5, characterized in that, The housing is also provided with a second limiting support below the first swing lever, which is used to limit the initial position of the first swing lever.

10. The cam double-rocker speed limiter with tensioning device according to claim 5, characterized in that, The electric driving device is connected with the second swing rod and used for driving the second swing rod to swing to make the pawl engage with the ratchet wheel.

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