Cam double-swing-rod speed limiter with tensioning device

Abstract

The invention relates to a cam double-swing-rod speed governor with a tensioning device, which comprises a car frame, a steel wire rope vertically arranged in a shaft, safety tongs mounted on the car frame and a speed governor, and the speed governor 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 invention relates to the technical field of elevator mechanical speed limiting protection devices, in particular to a cam double-rocker speed limiter with a tensioning device. Background Art

[0002] In the prior art, the elevator speed limiter is an important device to ensure the safe operation of the elevator. Its function is to trigger the safety clamp to stop the elevator when the elevator speed exceeds the set value to prevent a fall accident.

[0003] Traditional elevator speed limiters are usually installed in the machine room or on the top of the shaft, and connected to the car through a wire rope. This installation method has some disadvantages: first, due to the long distance between the speed limiter and the car, the wire rope is long, resulting in a long signal transmission time, and the elasticity of the wire rope may cause the safety clamp lifting mechanism connected to the wire rope to fail to operate in time, resulting in a relatively slow response speed of the safety clamp, which may increase the risk of accidents in emergency situations of elevator overspeeding; second, the longer wire rope increases the material cost, and the installation process is also more complicated, and the tensioning device at the lower end requires a lot of space, which increases the installation cost.

[0004] For example, an elevator speed limiter car frame mounting structure with application number CN202223396965.6, a limit rail is connected to the speed limiter, the limit rail is installed on the elevator car frame, the speed limiter is arranged between the limit rails, the speed limiter is connected to the wire rope tensioning device through the speed limiter wire rope, the speed limiter is connected to the safety clamp connecting rod, and the safety clamp connecting rod is connected to the safety clamp. Although the above scheme solves the problem of slow response speed of the safety clamp, it still has the following disadvantages: it relies on the tensioning device to maintain the tension of the wire rope. When the tensioning device fails, the speed limiter may not work normally, posing a safety hazard. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a faster and more reliable cam double rocker speed limiter with a tensioning device.

[0006] In order to achieve the above-mentioned object, the cam double rocker speed limiter with a tensioning device designed by the present invention comprises a car frame, a steel wire rope vertically arranged in a hoistway, a safety clamp and a speed limiter installed on the car frame, wherein the speed limiter is driven by the steel wire rope, and further comprises:

[0007] A lifting rod, connecting the speed limiter and the lifting arm of the safety clamp, and used to lift the lifting arm in response to the action of the speed limiter when the elevator is running at an overspeed;

[0008] A tensioning device connected to the steel wire rope and configured to swing under the tension of the steel wire rope;

[0009] Tension travel switch, connected in series to the elevator safety circuit;

[0010] Wherein, the tensioning device is provided with two travel triggering points, and the two travel triggering points are respectively used to trigger the tensioning travel switch when the tensioning device swings upward a predetermined distance and swings downward a predetermined distance.

[0011] Preferably, the tensioning device includes a first bracket, a pivot and a swing arm, one end of the wire rope is connected to the swing arm, and the swing arm is rotatably mounted on the first bracket around the pivot; the swing arm is provided with a balancing member for applying force to the swing arm to keep the swing arm in a predetermined position.

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

[0013] Preferably, the tensioning device includes a second bracket, a first connecting rod, a second connecting rod, a fixed shaft, a first movable shaft and a second movable shaft, the second bracket defines a groove space, the fixed shaft is fixed in the groove space; two guide grooves are provided on the groove wall of the groove space, the first movable shaft is slidably engaged in the guide grooves and is connected to 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 wire rope is connected to the second movable shaft.

[0014] Preferably, the speed limiter includes a shell, in which a first shaft and a first rocker arm are provided, a synchronously rotating rope pulley, a cam and a ratchet are rotatably mounted on the first shaft, and the middle part of the first rocker arm is rotatably mounted on the first shaft; one end of the first rocker arm is connected to the lifting rod, and the other end is provided with a second shaft, and a second rocker arm with a middle part rotatably mounted on the second shaft; one end of the second rocker arm is provided with a pressure wheel, and a spring for pulling the second rocker arm so that the pressure wheel presses against the cam surface of the cam; the other end of the second rocker arm is provided with a pawl matched with the ratchet wheel.

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

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

[0017] Preferably, the shell is further provided with a first limit bracket and a return spring located above the first rocker arm, the lifting rod passes through the first limit bracket, and the first limit bracket and the lifting rod are respectively provided with coaxial holes; the lifting rod is provided with a push rod cap and a stop portion, the push rod cap is located at one end of the lifting rod passing through the first limit bracket, the stop portion is located between the two holes, and the diameters of the push rod cap and the stop portion are both larger than the diameter of the hole; the return spring is sleeved on the lifting rod, and the two ends of the return spring sleeve are respectively against the first limit bracket and the stop portion; an electrical switch is provided near the push rod cap, and when the lifting rod lifts the lifting arm of the safety clamp, the push rod cap triggers the electrical switch.

[0018] Preferably, a second position-limiting bracket is further provided in the housing, and the second position-limiting bracket is located below the first swing rod and is used to limit the starting position of the first swing rod.

[0019] Preferably, it also includes an electric drive device, which is connected to the second swing rod and is used to drive the second swing rod to swing so that the pawl is engaged with the ratchet wheel.

[0020] The cam double rocker speed limiter with a tensioning device designed in the present invention has a double trigger point tensioning device which can effectively avoid malfunction or failure caused by abnormal wire rope tension, thereby improving the reliability of the speed limiter. By directly installing the speed limiter on the car frame, the length of the wire rope is shortened, the response speed of the safety clamp is significantly improved, and the safety of elevator operation is effectively enhanced. The integrated design of the device simplifies the structure and reduces the manufacturing cost and installation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the linkage between a cam double rocker speed limiter with a tensioning device and a safety clamp provided in an embodiment of the present application;

[0022] Figure 2 yes Figure 1 The enlarged schematic diagram at A in the middle;

[0023] Figure 3 The cam double rocker speed limiter with a tensioning device provided in the embodiment of the present application is schematically shown in FIG. Figure 1 ;

[0024] Figure 4 The cam double rocker speed limiter with a tensioning device provided in the embodiment of the present application is schematically shown in FIG. Figure 2 ;

[0025] Figure 5 is a schematic diagram of the linkage between the first swing rod and the second swing rod provided in an embodiment of the present application;

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

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

[0028] Figure 8 It is a schematic diagram of the linkage between the rope pulley and the tensioner provided in an embodiment of the present application.

[0029] Among them: car frame 10, wire rope 20, rope head seat 21, safety clamp 30, lifting arm 31, speed limiter 40, housing 41, hole 41a, first limit bracket 411, reset spring 412, second limit bracket 413, first shaft 42, first swing rod 43, rope wheel 44, cam 45, ratchet 46, second shaft 47, second swing rod 48, pressure wheel 481, spring 482, ratchet 483, tension wheel 49, third shaft 491, lifting rod 50, top rod cap 51, stop The retreat portion 52, the electrical switch 53, the first mounting bracket 531, the tensioning device 60, the stroke trigger point 60a, the first bracket 61, the pivot 62, the fourth mounting bracket 621, the swing arm 63, the balance member 64, the tensioning stroke switch 70, the third mounting bracket 71, the second bracket 80, the first connecting rod 81, the second connecting rod 82, the fixed axis 83, the first movable axis 84, the second movable axis 85, the groove space 86, the guide groove 87, the electric drive device 90, the second mounting bracket 91, and the push rod 92. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0031] like Figures 1 to 8 As shown, the cam double rocker speed limiter with a tensioning device described in this embodiment includes a car frame 10, a steel wire rope 20 vertically arranged in the hoistway, a safety clamp 30 installed on the car frame 10 and a speed limiter 40, and the speed limiter 40 is driven by the steel wire rope 20. When the elevator is overspeeding, the speed limiter will trigger the braking 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 hoistway.

[0032] The speed limiting device also includes:

[0033] The lifting rod 50 is connected to the lifting arm 31 of the speed limiter 40 and the safety clamp 30, and is used to respond to the action of the speed limiter 40 when the elevator is overspeeding to lift the lifting arm 31. When the elevator is overspeeding, the speed limiter 40 drives the lifting rod 50 through the driving force generated by the wire rope 20, and then drives the lifting arm 31, activates the safety clamp 30, and realizes the braking function. The safety clamp 30 used in this embodiment can be a mature existing product, and its lifting arm 31 is connected to the lifting rod 50 by hinged connection, which ensures 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 tension of the steel wire rope 20. In this embodiment, the tensioning device 60 mainly maintains the appropriate tension of the steel wire rope 20 to prevent the steel wire rope 20 from being too loose or too tight, thereby preventing malfunction or failure caused by abnormal tension of the steel wire rope 20, that is, improving the reliability of the speed limiter 40 and ensuring that the elevator can still work stably in abnormal situations.

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

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

[0037] In addition, the speed limiter 40 provided in this embodiment is installed on the car frame 10 together with the safety clamp 30, and the safety clamp 3 is rigidly connected to the speed limiter 40 through the lifting rod 50, and the transmission path is shorter, so that the safety clamp 30 can respond to the overspeed situation of the elevator more quickly and quickly complete the braking action. At the same time, since the speed limiter 40 moves synchronously with the car frame 10, the wire rope 20 only needs to be set in one direction in the hoistway, 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, Figure 6 , Figure 8As shown, the tensioning device 60 includes a first bracket 61, a pivot 62 and a swing arm 63. One end of the wire rope 20 is connected to the swing arm 63, and the swing arm 63 is rotatably mounted on the first bracket 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 specific implementation, the first bracket 61 can be fixed to the car guide rail of the elevator car by bolts; one end of the 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 wire rope 20 directly acts on the swing arm 63, causing the swing arm 63 to move accordingly, and the balance member 64 is used to apply appropriate force to keep the swing arm 63 at a predetermined position, ensuring that the tension of the wire rope is maintained within a reasonable range, preventing the wire rope 20 from being too loose or too tight, thereby avoiding malfunction or device failure caused by improper tension. In addition, the two travel trigger points 60a are connected to the pivot 62 through the fourth mounting bracket 621, and the tension travel switch 70 is installed on the first bracket 61 through the third mounting bracket 71, or directly installed on the first bracket 61 through a fastener, and the installation position is close to the pivot 62. When the swing arm 63 swings due to the change of the tension of the wire rope 20, the pivot 62 drives the fourth mounting bracket 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 accidents from happening in the elevator to remind the staff to perform maintenance. In this embodiment, the travel trigger point 60a is an external convex structure integrated with the fourth mounting bracket 621.

[0040] In one embodiment, if Figure 6 As shown, the balancing member 64 is a counterweight. The counterweight as the balancing member 64 has a very simple structure, is easy to implement and manufacture, does not require a complex mechanical structure or a precise adjustment device, and only requires a counterweight of a suitable weight. It can maintain a stable force for a long time and is not easily affected by changes in the external environment (such as temperature changes, wear, etc.). In another embodiment, the balancing member 64 is a tension spring. The tension spring usually has a small volume and can achieve effective tension adjustment in a space-constrained environment, which is particularly suitable for devices that require miniaturization and compact space.

[0041] In other embodiments, Figure 7 , Figure 8As shown, the tensioning device 60 includes a second bracket 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 bracket 80 defines a groove space 86, and the fixed shaft 83 is fixed in the groove space 86; two guide grooves 87 are provided on the groove wall of the groove space 86, and the first movable shaft 84 is slidably fitted in the guide groove 87 and connected to 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 wire rope 20 is connected to the second movable shaft 85.

[0042] In specific implementation, the second bracket 80 is fixed in the pit of the elevator shaft by bolts to provide solid support. One end of the wire rope 20 is fixed to the top of the shaft, and the other end is connected to the second movable shaft 85 through the rope head seat 21, so that the tension change of the 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 bracket 80 defines a slot space 86, in which the first movable shaft 84 is located in the slot and can slide in the guide slot 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 wire rope 20 changes, the tension spring drives the second movable shaft 85 to slide in the guide slot 87 through the action of this structure, driving the rope head seat 21 to move downward, thereby pulling the wire rope 20 to continue to move downward and continuously applying tension. The tensioning device 60 provided in this embodiment integrates multiple functional components into a slot space 86, and the structural design is simple and efficient, which 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, 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 rod 43 are arranged in the housing 41, a rope wheel 44, a cam 45 and a ratchet 46 which rotate synchronously are rotatably mounted on the first shaft 42, and the middle part of the first swing rod 43 is rotatably mounted on the first shaft 42; one end of the first swing rod 43 is connected to the lifting rod 50, and the other end is provided with a second shaft 47, and a second swing rod 48 whose middle part is rotatably mounted on the second shaft 47; one end of the second swing rod 48 is provided with a pressure wheel 481, and a spring 482 which pulls the second swing rod 48 so that the pressure wheel 481 is against the cam surface of the cam 45; the other end of the second swing rod 48 is provided with a ratchet 483 which is adapted to the ratchet 46. In this embodiment, a hole 41a is opened on the housing 41 for the wire rope 20 and the lifting rod 40 to pass through. In this embodiment, the ratchet 483 and the second swing rod 48 are integrally constructed.

[0044] When the elevator is operating normally, the wire rope 20 passes around the rope pulley 44, driving the cam 45 and the ratchet 46 to rotate around the first axis 42. At this time, one end of the second swing arm 48 is pressed against the cam surface of the cam 45 through the pressure wheel 481 under the action of the spring 482, so that the second swing arm 48 swings around the second axis 47 along the contour of the cam 45. In this case, the ratchet 483 at the other end of the second swing arm 48 does not contact the ratchet 46, maintaining a normal operating state.

[0045] However, when the elevator exceeds the speed limit when descending, the rotation speed of the rope pulley 44 and the cam 45 will exceed the predetermined safety threshold. At this time, since the elastic force of the spring 482 is not sufficient to continue to press the pressure wheel 481 on the cam surface of the cam 45, the angle of the second rocker arm 48 changes, causing the pawl 483 to hook the ratchet 46. At this time, the first rocker arm 43 will rotate around the first axis 42 under the action of inertia, driving the lifting rod 50 to move upward. Subsequently, the lifting rod 50 pulls up the lifting arm 31 of the safety clamp 30 and activates the braking mechanism to stop the elevator from exceeding the speed limit when descending, thereby ensuring the safety of the elevator.

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

[0047] In some embodiments, Figure 4 , Figure 8As shown, at least one tension wheel 49 is also provided in the housing 41, and the wire rope 20 is wound around the rope wheel 44 and the tension wheel 49. In specific implementation, the tension wheel 49 is installed in the housing 41 through the third shaft 491, and is staggered with the rope wheel 44 up and down. The design of the tension wheel 49 can effectively adjust the tension of the wire rope 20, ensure that the wire rope 20 and the rope wheel 44 maintain a proper contact pressure, thereby preventing the wire rope 20 from being loose or too tight. Specifically, the wire rope 20 passes around the rope wheel 44 and passes through the tension wheel 49, forming a wrap angle on the rope wheel 44, which effectively increases the contact area between the wire rope 20 and the rope wheel 44. The larger contact area significantly increases the friction between the wire rope 20 and the rope wheel 44, and the enhanced friction reduces the risk of sliding or slipping, so as to help the wire rope 20 better maintain the correct tension state, and ensure that the speed limiter 40 can respond quickly when the elevator is overspeeding.

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

[0049] In some embodiments, Figure 4 As shown, a first limit bracket 411 and a return spring 412 located above the first rocker arm 43 are also provided in the housing 41, and the lifting rod 50 passes through the first limit bracket 411, and coaxial holes are respectively provided on the first limit bracket 411 and the lifting rod 50; a top rod cap 51 and a stop portion 52 are provided on the lifting rod 50, the top rod cap 51 is located at one end of the lifting rod 50 passing through the first limit bracket 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 both larger than the diameter of the hole; the return spring 412 is sleeved on the lifting rod 50, and the two ends of the return spring 412 sleeve are respectively against the first limit bracket 411 and the stop portion 52; an electrical switch 53 is provided near the top rod cap 51, and when the lifting rod 50 lifts 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 lifting rod 50 .

[0050] With this structural design, the return spring 412 ensures that the position of the lifting rod 50 passing through the two holes is stable by abutting between the first limit bracket 411 and the stopper 52. In the embodiment, the side of the stopper 52 away from the first limit bracket 411 contacts the first swing rod 43, so that the elastic force of the return spring 412 is used to keep the first swing rod in a stable position. In this way, the return spring 412 not only provides a stable return pressure for the lifting rod 50, but also ensures the accurate positioning of the first swing rod 43, effectively preventing position deviation.

[0051] When the elevator is overspeeding, the elastic force of the spring 482 is insufficient to continue to press the pressure wheel 481 on the cam surface of the cam 45, which causes the angle of the first swing rod 43 to change and causes the pawl 483 to hook the ratchet 46. At this time, the first swing rod 43 will rotate around the first shaft 42 under the action of inertia, driving one end of the first swing rod 43 to move upward until it contacts the stopper 52 and compresses the reset spring 412, and then the lifting rod 50 moves upward, pulling up the lifting arm 31 of the safety clamp 30, triggering the safety clamp 30 to perform a braking operation. At the same time, before the lifting rod 50 triggers the safety clamp 30, the movement drives the top rod cap 51 to move upward synchronously, triggering the electrical switch 53 before the lifting rod 50. In this embodiment, the electrical switch 53 is fixedly installed in the housing 41 through the first mounting bracket 531, and can communicate with the control system of the elevator.

[0052] In some embodiments, Figure 4 As shown, a second limit bracket 413 is further provided in the housing 41, and the second limit bracket 413 is located below the first swing rod 43, and is used to limit the starting position of the first swing rod 43. That is, when the elevator is overspeeding in the downward direction, the first swing rod 43 will swing under the action of tension, triggering the safety clamp 30. In this process, the second limit bracket 413 ensures the maximum movement range of the first swing rod 43 through physical restrictions, and avoids the influence of the movement of the first swing rod 43 beyond the range on the stability and accuracy of the system.

[0053] In some embodiments, Figure 4 , Figure 5 As shown, it also includes an electric drive device 90, which is connected to the second swing rod 48 and is used to drive the second swing rod 48 to swing so that the pawl 483 is engaged with the ratchet 46.

[0054] During specific implementation, the electric drive device 90 is installed in the housing 41 through the second mounting bracket 91, and a push rod 92 is provided at the end of the first rocker arm 43 that is away from the end connected to the lifting rod 50. The electric drive device 90 can use an electromagnet push-pull device to push against the push rod 92, thereby driving the second rocker arm 48 to swing around the second axis 47, so that the pawl 483 hooks the ratchet 46, and then the first rocker arm 43 swings around the first axis 42. This design realizes the active triggering function of the safety clamp 30. For example, when the elevator needs to be inspected and repaired, the operator can use remote control or simple control instructions to let the electric drive device 90 push the second rocker arm 48 to drive the first rocker arm 43 to swing and drive the lifting rod 50 to move upward, and then pull the lifting arm 31, thereby triggering the action of the safety clamp 30 and realizing the external triggering of the speed limiter.

[0055] The cam double rocker speed limiter with a tensioning device provided in this embodiment has a double trigger point tensioning device which can effectively avoid malfunction or failure caused by abnormal wire rope tension, thereby improving the reliability of the speed limiter. By directly installing the speed limiter on the car frame, the length of the wire rope is shortened, the response speed of the safety clamp is significantly improved, and the safety of elevator operation is effectively enhanced. The integrated design of the device simplifies the structure and reduces the manufacturing cost and installation cost.

[0056] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0057] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cam double rocker speed limiter with a tensioning device, comprising a car frame, a steel wire rope vertically arranged in a hoistway, a safety clamp and a speed limiter installed on the car frame, wherein the speed limiter is driven by the steel wire rope, and is characterized in that: Also includes: A lifting rod, connecting the speed limiter and the lifting arm of the safety clamp, and used to lift the lifting arm in response to the action of the speed limiter when the elevator is running at an overspeed; A tensioning device connected to the steel wire rope and configured to swing under the tension of the steel wire rope; Tension travel switch, connected in series to the elevator safety circuit; Wherein, the tensioning device is provided with two travel triggering points, and the two travel triggering points are respectively used to trigger the tensioning travel switch when the tensioning device swings upward a predetermined distance and swings downward a predetermined distance.

2. The cam double rocker speed limiter with a tensioning device according to claim 1, characterized in that: The tensioning device includes a first bracket, a pivot and a swing arm, one end of the wire rope is connected to the swing arm, and the swing arm is rotatably mounted on the first bracket around the pivot; a balancing piece is provided on the swing arm for applying force to the swing arm to keep the swing arm in a predetermined position.

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

4. The cam double rocker speed limiter with a tensioning device according to claim 1, characterized in that: The tensioning device includes a second bracket, a first connecting rod, a second connecting rod, a fixed shaft, a first movable shaft and a second movable shaft. The second bracket defines a groove space, and the fixed shaft is fixed in the groove space; two guide grooves are provided on the groove wall of the groove space, and the first movable shaft is slidably engaged in the guide grooves and connected to 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 wire rope is connected to the second movable shaft.

5. The cam double rocker speed limiter with a tensioning device according to any one of claims 1 to 4, characterized in that: The speed limiter includes a shell, in which a first shaft and a first swing arm are arranged, a synchronously rotating rope wheel, a cam and a ratchet are rotatably mounted on the first shaft, and the middle part of the first swing arm is rotatably mounted on the first shaft; one end of the first swing arm is connected to the lifting rod, and the other end is provided with a second shaft, and a second swing arm with a middle part rotatably mounted on the second shaft; one end of the second swing arm is provided with a pressure wheel, and a spring for pulling the second swing arm to make the pressure wheel press 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. The cam double rocker speed limiter with a tensioning device according to claim 5, characterized in that: The first swing arm is a frame-shaped structure capable of accommodating the rope wheel, cam, ratchet and second swing arm.

7. The cam double rocker speed limiter with a tensioning device according to claim 5, characterized in that: At least one tensioning wheel is also arranged in the shell, and the steel wire rope is wound around the rope wheel and the tensioning wheel.

8. The cam double rocker speed limiter with a tensioning device according to claim 5, characterized in that: The shell is also provided with a first limit bracket and a return spring located above the first rocker arm, the lifting rod passes through the first limit bracket, and the first limit bracket and the lifting rod are respectively provided with coaxial holes; the lifting rod is provided with a push rod cap and a stop portion, the push rod cap is located at one end of the lifting rod passing through the first limit bracket, the stop portion is located between the two holes, and the diameters of the push rod cap and the stop portion are both larger than the diameters of the holes; the return spring is sleeved on the lifting rod, and the two ends of the return spring sleeve are respectively against the first limit bracket and the stop portion; an electrical switch is provided near the push rod cap, and when the lifting rod lifts the lifting arm of the safety clamp, the push rod cap triggers the electrical switch.

9. The cam double rocker speed limiter with a tensioning device according to claim 5, characterized in that: A second position-limiting bracket is also provided in the housing. The second position-limiting bracket is located below the first swing rod and is used to limit the starting position of the first swing rod.

10. The cam double rocker speed limiter with a tensioning device according to claim 5, characterized in that: It also includes an electric drive device, which is connected to the second swing rod and is used to drive the second swing rod to swing so that the pawl is engaged with the ratchet wheel.

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