Speed limiter triggering structure

Abstract

The utility model discloses a trigger structure of a speed limiter. The trigger structure comprises a rope wheel, a flail block, a connecting rod and a spring assembly, the rope wheel is provided with a rotating central axis; the two groups of flail blocks are respectively arranged on two opposite sides of the rotating central axis; the throwing block comprises a centrifugal swing arm and a throwing head structure arranged on the centrifugal swing arm, and the weight of the throwing head structure can be increased or decreased; the centrifugal swing arm is provided with a rotary connection position rotationally connected with the rope wheel; the head shaking structure is far away from the rotary connection position; the first end of the connecting rod is rotationally connected with the centrifugal swing arm on the first side, and the second end is rotationally connected with the centrifugal swing arm on the second side; the spring assembly is connected between the centrifugal swing arm on the first side and the rope wheel and has elastic acting force acting on the centrifugal swing arm on the first side. According to the utility model, the trigger of the speed governor does not need to be manually operated in a close range, the trigger process of the speed governor is safe and reliable, labor is saved, and the test requirement of the speed governor is effectively met.

Description

Technical Field

[0001] The utility model relates to the technical field of elevators, in particular to a speed limiter triggering structure. Background Art

[0002] According to A1.3.4 linkage test in TSG T7001-2023 "Rules for Elevator Supervision and Periodic Inspection": "During supervision and inspection, if a progressive safety clamp is used, the car is loaded with a load of 125% of the rated load, and the elevator is driven downward at the rated speed. The speed limiter-safety clamp linkage test is carried out to observe whether the speed limiter and safety clamp are reliable. After the test, no damage that has an adverse effect on the normal use of the elevator occurs". At present, there are mainly the following ways to manually trigger the speed limiter for linkage testing:

[0003] like Figure 1 As shown, it is triggered by stepping on the foot, and the operator steps on the box plate position and holds it until the speed limiter rope wheel is stopped.

[0004] like Figure 2 As shown, it is triggered by a manual lever: the operator operates the lever to push it down in the direction of the arrow and hold it until the rope wheel is stopped.

[0005] like Figure 3 , 4 As shown, trigger with the help of a tool (wrench): The speed limiter is equipped with a special wrench. Trigger and reset the speed limiter according to the operation shown in the figure.

[0006] In the above triggering methods, whether it is to trigger the speed limiter by stepping on the foot, manually shifting the lever or using a tool (wrench), the speed limiter needs to be operated at close range. Once the speed limiter is abnormal, it is easy to cause uncontrollable danger to the operator. In addition, in the above manual triggering methods, whether it is to trigger the speed limiter by stepping on the foot, manually shifting the lever or using a tool (wrench), a large holding force is required. For example, when stepping on the box-type plate, the foot strength must be maintained until the speed limiter wire rope is stopped; when manually shifting the lever, the hand needs to have a holding force until the rope pulley stops rotating. The operation is more laborious and it is difficult to maintain a stable force. Utility Model Content

[0007] In view of the above-mentioned technical problems, the purpose of the utility model is to propose a speed limiter triggering structure, which does not require close-range human operation to trigger the speed limiter. The speed limiter triggering process is safe, reliable, and labor-saving, and effectively meets the test requirements of the speed limiter.

[0008] The technical solution of the utility model is achieved as follows: a speed limiter triggering structure, including a rope wheel, a swing block, a connecting rod, and a spring assembly;

[0009] The rope pulley has a central axis of rotation;

[0010] The two groups of swing blocks are arranged on opposite sides of the central axis of rotation; the swing blocks include a centrifugal swing arm and a swing head structure which is arranged on the centrifugal swing arm and whose weight can be increased or decreased;

[0011] The centrifugal swing arm has a rotation connection position that is rotationally connected to the rope wheel; the swing head structure is far away from the rotation connection position;

[0012] The first end of the connecting rod is rotatably connected to the centrifugal swing arm on the first side, and the second end is rotatably connected to the centrifugal swing arm on the second side;

[0013] The spring assembly is connected between the centrifugal swing arm on the first side and the rope pulley, and has an elastic force acting on the centrifugal swing arm on the first side.

[0014] Furthermore, the head-shaking structure includes a first head-shaking and a second head-shaking; the head-shaking structure has a test state in which only the first head-shaking or the second head-shaking is used, and a running state in which the first head-shaking and the second head-shaking are used simultaneously.

[0015] Furthermore, the weights of the first and second shaking heads are different.

[0016] Furthermore, the first swing head and the second swing head are fixedly connected to the centrifugal swing arm via a bolt assembly.

[0017] Furthermore, the spring assembly includes a connecting block, a seat body, an adjusting screw, an adjusting nut, and a spring; the connecting block is arranged on the centrifugal swing arm on the first side; the seat body is arranged on the pulley; the adjusting screw is movably inserted into the seat body and is threadedly connected to the connecting block; the adjusting nut is threadedly connected to the adjusting screw; the spring is sleeved on the adjusting screw and is located between the adjusting nut and the seat body.

[0018] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0019] The utility model uses a swing block, the weight of which can be increased or decreased. By manually adjusting the weight value of the swing block, the centrifugal force of the speed limiter can be adjusted to trigger the speed limiter to act when the rated speed of the elevator is reached. There is no need to operate the speed limiter at close range when the elevator is running at the rated speed, and the operator is not required to have a holding force when the speed limiter is triggered. The speed limiter triggering process is safe, reliable, and labor-saving, and effectively meets the test requirements of the speed limiter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The technical solution of the utility model is further described below in conjunction with the accompanying drawings:

[0021] Figure 1 This is the first method of triggering the speed limiter for linkage test in the prior art;

[0022] Figure 2 This is the second method of triggering the speed limiter for linkage test in the prior art;

[0023] Figure 3 This is the third method of triggering the speed limiter for linkage test in the prior art;

[0024] Figure 4 for Figure 3 A structural diagram of another operating state;

[0025] Figure 5 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 6 It is a three-dimensional structural schematic diagram of the block-throwing structure of the utility model in the running state;

[0027] Figure 7 for Figure 6 A schematic diagram of a three-dimensional structure from another perspective;

[0028] Figure 8 It is a three-dimensional structural schematic diagram of the block-throwing structure of the utility model in a test state;

[0029] Fig. 9 for Figure 8 Exploded view of;

[0030] Fig.10 This is the test principle diagram of the utility model;

[0031] Among them: 1. rope pulley; 2. centrifugal swing arm; 3. swing head structure; 31. first swing head; 32. second swing head; 4. connecting rod; 5. spring assembly; 51. adjusting screw; 52. seat body; 53. connecting block; 54. adjusting nut; 55. spring; 6. bolt assembly. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0033] like Figure 5-10The present invention shows a speed limiter trigger structure described in this embodiment, which includes a rope wheel 1, a swing block, a connecting rod 4, and a spring 55 assembly 5. The rope wheel 1 has a rotation center axis, and the rope wheel 1 can rotate around the rotation center axis under the action of external force. Two swing blocks are arranged on opposite sides of the rotation center axis, and each includes a centrifugal swing arm 2 and a swing head structure. Among them, a rotating shaft is fixed on the centrifugal swing arm 2. The centrifugal swing arm 2 is rotatably connected to the rope wheel 1 through the cooperation of the rotating shaft and the bearing, and a rotation connection position is formed. The central axis of the rotating shaft is arranged in the same direction as the rotation center axis. A swing head structure 3 is installed on the two centrifugal swing arms 2 away from the rotation connection position. The swing head structure 3 is detachably fixed on the centrifugal swing arm 2, and the weight can be increased or decreased. The swing head structure 3 is arranged at a position on the centrifugal swing arm 2 away from the rotation connection position. By increasing or decreasing the weight of the swing head structure 3, the overall weight of the swing block can be changed. When the rope wheel 1 rotates, the swing block opens to the outside of the outer rope wheel 1 under the action of centrifugal force.

[0034] The first end of the aforementioned connecting rod 4 is rotatably connected to the centrifugal swing arm 2 on the first side, and the second end is rotatably connected to the centrifugal swing arm 2 on the second side. Through the linkage of the connecting rod 4, the swinging states of the two centrifugal swing arms 2 are consistent.

[0035] The aforementioned spring 55 assembly 5 is connected between the centrifugal swing arm 2 and the rope pulley 1 on the first side, and has an elastic force acting on the centrifugal swing arm 2 on the first side. Through the elastic force of the spring 55 assembly 5, the degree of throwing out of the centrifugal swing arm 2 on the first side can be controlled. The above-mentioned spring assembly 5 includes a connecting block 53, a seat body 52, an adjusting screw 51, an adjusting nut 54, and a spring 55. The connecting block 53 is arranged on the centrifugal swing arm 2 on the first side. The seat body 52 is arranged on the rope pulley 1. The adjusting screw 51 is movably inserted into the seat body 52 and is threadedly connected to the connecting block 53. The adjusting nut 54 is threadedly connected to the adjusting screw 51. The spring 55 is sleeved on the adjusting screw 51 and is located between the adjusting nut 54 and the seat body 52. ​​By screwing the adjusting nut 54, the telescopic length of the spring 55 can be changed, and then the swing amplitude of the aforementioned centrifugal swing arm 2 on the first side can be adjusted.

[0036] The aforementioned head-shaking structure 3 includes a first head-shaking head 31 and a second head-shaking head 32. In the present embodiment, the head-shaking structure 3 is a cylindrical structure. The first head-shaking head 31 and the second head-shaking head 32 are combined with each other to form the head-shaking structure 3. The first head-shaking head 31 and the second head-shaking head 32 are fixedly connected to the centrifugal swing arm 2 by a bolt assembly 6 so as to be disassembled and replaced. When designing the specific structure, the weights of the first head-shaking head 31 and the second head-shaking head 32 are different. The head-shaking structure 3 has a test state in which only the first head-shaking head 31 or the second head-shaking head 32 is used, and an operating state in which the first head-shaking head 31 and the second head-shaking head 32 are used at the same time.

[0037] The specific test state and operation state configuration of the above-mentioned head shaking structure are shown in the following table:

[0038]

[0039] By artificially increasing or decreasing the weight of the first swing head 31 and the second swing head 32, the centrifugal force P0 generated by the entire swing weight when the rope wheel 1 rotates can be changed.

[0040] like Fig.10 As shown, the calculation method of the centrifugal force P0 is:

[0041]

[0042] in:

[0043] m—mass of the thrown block, m=m1+m2, (kg)

[0044] G—weight of the block, G=G1+G2, (N)

[0045] r—the radius from the center of gravity X3 of the swing block to the rotation center X1 of the rope pulley (m);

[0046] ω — angular velocity;

[0047] n—revolutions per minute (r / min);

[0048] If the friction force at the rotating shaft of the centrifugal swing arm is ignored, the centrifugal force P0 and the spring force P f In equilibrium, there are:

[0049] P0a=P f b. Substitute P0 into the formula and rearrange it to get:

[0050]

[0051] in:

[0052] a—the distance from the center of gravity X3 of the swing block to the center of its rotation axis X2 (m);

[0053] b—vertical distance from the spring's fulcrum to the center of the swing block's rotation axis X2 (m);

[0054] As the speed of the sheave of the speed limiter changes, the angle at which the swing block opens outward becomes larger and larger. Therefore, during the rotation process, the radius r from the center of gravity X3 of the swing block to the rotation center X1 of the sheave is not a constant, but changes.

[0055] When the elevator running speed reaches the speed limiter action speed, the swing block swings outward and causes the trigger device to act. At this moment, the radius r from the center of gravity X3 of the swing block to the rotation center X1 is: r = r0 + Δr, where:

[0056] r0—the radius from the center of gravity X3 to the rotation center X1 when the elevator is stopped;

[0057] Δr—When the elevator running speed reaches the speed limiter action speed, the increment of the rotation radius from the center of gravity of the swing block to the rotation center X1. Δr depends on the distance between the swing block and the trigger device in the structural design. Therefore, there is:

[0058]

[0059] P f It is the spring tension required when the speed limiter reaches the action speed. We can understand that the higher the speed limiter action speed, the greater the spring tension required. Assume that the preset spring force when the speed limiter is stationary is P f , the swing block is from the position closest to the speed governor axle when the elevator stops to the maximum position when the speed governor is activated. The spring deformation length is L, so the elastic coefficient K of the spring can be obtained as:

[0060]

[0061] According to the spring reaction force P f The dimensional parameters of the spring can be determined by the elastic coefficient K, and the parameters of the spring can also be regained by adjusting the design structure of the speed limiter.

[0062] When it is necessary to conduct a speed limiter-safety clamp linkage test, keep the elastic coefficient K unchanged, and artificially change the change of the swing block G value to meet the requirement that when the elevator running speed reaches the rated speed, the speed limiter swing block is thrown out, driving the trigger device, and then stopping the speed limiter wire rope, pulling the safety clamp to stop the car.

[0063] According to the above structural design, the weight of the swing block can be increased or decreased. By manually adjusting the weight value of the swing block, the centrifugal force of the speed limiter can be adjusted to trigger the speed limiter to act when the rated speed of the elevator is reached. There is no need to operate the speed limiter at close range when the elevator is running at the rated speed, and the operator does not need to have a constant holding force when the speed limiter is triggered. The speed limiter triggering process is safe, reliable, and labor-saving, effectively meeting the speed limiter test requirements.

[0064] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A speed limiter triggering structure, comprising a rope wheel, a swing block, a connecting rod, and a spring assembly; characterized in that: The rope pulley has a central axis of rotation; The two groups of swing blocks are arranged on opposite sides of the central axis of rotation; the swing blocks include a centrifugal swing arm and a swing head structure which is arranged on the centrifugal swing arm and whose weight can be increased or decreased; The centrifugal swing arm has a rotation connection position that is rotationally connected to the rope wheel; the swing head structure is far away from the rotation connection position; The first end of the connecting rod is rotatably connected to the centrifugal swing arm on the first side, and the second end is rotatably connected to the centrifugal swing arm on the second side; The spring assembly is connected between the centrifugal swing arm on the first side and the rope pulley, and has an elastic force acting on the centrifugal swing arm on the first side.

2. A speed limiter triggering structure according to claim 1, characterized in that: The head-shaking structure comprises a first head-shaking and a second head-shaking; the head-shaking structure has a test state in which only the first head-shaking or the second head-shaking is used, and a running state in which the first head-shaking and the second head-shaking are used simultaneously.

3. A speed limiter triggering structure according to claim 2, characterized in that: The first impulse head and the second impulse head have different weights.

4. A speed limiter triggering structure according to claim 2, characterized in that: The first swing head and the second swing head are fixedly connected to the centrifugal swing arm through a bolt assembly.

5. The speed limiter triggering structure according to claim 1, characterized in that: The spring assembly includes a connecting block, a seat body, an adjusting screw, an adjusting nut, and a spring; the connecting block is arranged on the centrifugal swing arm on the first side; the seat body is arranged on the rope pulley; the adjusting screw is movably inserted into the seat body and is threadedly connected to the connecting block; the adjusting nut is threadedly connected to the adjusting screw; the spring is sleeved on the adjusting screw and is located between the adjusting nut and the seat body.

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