Triggering device and triggering method for free falling body test of progressive safety tongs of elevator

Abstract

The invention discloses a trigger device and a trigger method for a free fall test of progressive safety tongs of an elevator, and relates to the technical field of elevator testing, the trigger device for the free fall test of the progressive safety tongs of the elevator comprises a pulley assembly, a traction rope, a fixing part, a sleeve and a blocking part; the pulley assembly comprises an upper pulley and a lower pulley; the traction rope is arranged between the upper pulley and the lower pulley in a sleeving manner and is provided with a first traction section; the fixing part is fixedly arranged on the first traction section so as to move up and down along with the traction rope, and the fixing part is used for being fixed to one end of the lifting rod; the sleeve sleeves the first traction section and is fixed with the traction rope through static friction force, the sleeve is positioned at the lower end of the fixed part, and a distance is reserved between the sleeve and the lower end of the first traction section; and the blocking part is positioned below the sleeve, is limited and is used for blocking the sleeve when the sleeve moves downwards along with the first traction section. According to the technical scheme, the problem that potential safety hazards exist due to the fact that an existing device needs to adjust the sleeve at high altitude can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of elevator testing, and in particular to a trigger device and a trigger method for a free fall test of a progressive safety clamp of an elevator. Background Art

[0002] At present, the free fall test of progressive safety clamps is generally carried out in the elevator test tower. The conventional test method is to install the progressive safety clamp under the test cage, and the test cage can move up and down along the fixed guide rail in the test tower. Before the test starts, the cage is lifted to a certain height and allowed to fall freely. When the designed maximum action speed is reached, the trigger device starts the safety clamp lifting mechanism, thereby causing the safety clamp to act.

[0003] Among the many triggering methods, a common triggering device is to fix the wire rope at the top and bottom of the test shaft, and install a sleeve that can slide frictionally on the wire rope. The friction force of the sleeve is set to be equal to the force applied to the control rope by the speed limiter corresponding to the safety clamp being tested, that is, the sleeve will be fixed on the wire rope by static friction. Before the test, the position of the sleeve under the lifting mechanism is determined according to the falling speed of the cage. During the free fall of the cage, the lifting mechanism falls along the wire rope with the cage. When the lifting mechanism reaches the sleeve position, it will collide with the sleeve. Under the upward force of the sleeve, the lifting mechanism is lifted upward relative to the cage, thereby triggering the action of the safety clamp.

[0004] However, in the safety clamp test of ultra-high-speed and heavy-load elevators, this traditional triggering method exposed many problems. Due to the high action speed of ultra-high-speed and heavy-load safety clamps, the free fall distance and braking distance are extremely long. Taking the safety clamp with a rated speed of 8m / s as an example, the distance can reach 25m. This requires the sleeve to be installed at a very high position, which not only increases the risk of high-altitude operations, but also makes it extremely inconvenient to adjust the friction between the sleeve and the wire rope at high altitudes, and it is difficult to control accurately. This kind of high-altitude working environment is complex, and the technical level and safety guarantee requirements of the operator are extremely high. Once the operation is wrong, it may cause serious safety accidents. Summary of the invention

[0005] The main purpose of the present invention is to propose a free fall test trigger device and a trigger method for a progressive safety clamp of an elevator, aiming to improve the problem that the existing progressive safety clamp free fall test trigger device of an elevator needs to adjust the sleeve at high altitude, which poses a potential safety hazard.

[0006] To achieve the above-mentioned purpose, the present invention proposes a progressive safety clamp free fall test triggering device for an elevator, comprising: The pulley assembly comprises an upper pulley and a lower pulley which are spaced apart from each other; A traction rope is arranged in a ring shape and is sleeved between the upper pulley and the lower pulley, and the traction rope has a first traction section; A fixing part, fixedly arranged on the first traction section of the traction rope so as to be able to move up and down along with the traction rope, and the fixing part is used to be fixed to one end of the lifting rod; a sleeve, which is sleeved on the first traction section of the traction rope and fixed to the traction rope by static friction, wherein the sleeve is located at the lower end of the fixing portion and a spacing is reserved between the sleeve and the lower end of the first traction section; and, The blocking portion is located below the sleeve and is limited in position, so as to resist the sleeve when the sleeve moves downward along with the first traction section, so as to limit the sleeve from continuing to move downward along with the first traction section.

[0007] In one embodiment, the blocking portion is movably connected to the first traction section.

[0008] In one embodiment, at least one of the upper pulley and the lower pulley is elastically mounted via an elastic member, and the elastic member enables at least one of the upper pulley and the lower pulley to elastically reset in a direction away from the other.

[0009] In one embodiment, the elastic member comprises a spring, one end of which is fixedly arranged, and the other end of which is connected to the lower pulley; The upper pulley is fixedly installed.

[0010] In one embodiment, the sleeve comprises: an inner sleeve, which is sleeved on the periphery of the first traction section and fixed to the inner sleeve by static friction; and, The outer sleeve is sleeved on the outer periphery of the inner sleeve.

[0011] In one embodiment, the sleeve includes two semi-cylindrical bodies, and the semi-cylindrical bodies are combined to form the sleeve.

[0012] In one embodiment, the two semi-cylindrical bodies are screwed and fixed by a screw connection.

[0013] In one embodiment, the inner sleeve is made of nylon, and the outer sleeve is made of iron.

[0014] The present invention also provides a triggering method for a free fall test of a progressive safety clamp of an elevator, the triggering method for the free fall test of a progressive safety clamp of an elevator comprising the following steps: Providing a free fall test trigger device for a progressive safety gear of an elevator as described in any one of the above items; Fix one end of the lifting rod of the safety clamp installed at the bottom of the cage to the fixing part, and move the cage to a high place; Moving the sleeve to a set position on the first traction section, wherein the set position is obtained according to a theoretical triggering distance of the safety clamp; The cage is in free fall, and the sleeve moves downward along with the cage to the blocking part and is limited downward by the blocking part. The sleeve applies an upward friction force to the first traction section, so that the downward speed of the first traction section and the fixed part is less than the falling speed of the cage, and the lifting rod is lifted to trigger the safety clamp.

[0015] In one embodiment, the sleeve is moved to a set position on the first traction section, wherein the set position is obtained according to a theoretical trigger distance of the safety clamp, wherein the theoretical trigger distance S=V 2 / 2a, V is the maximum action speed of the safety clamp, and a is the acceleration of the cage during free fall.

[0016] When the technical solution of the present invention is used, the device is first adjusted so that the traction rope is in a tensioned state, and then one end of the lifting rod of the safety clamp installed at the bottom of the cage is fixed on the fixed part, and the cage is moved to a high place, and then the theoretical trigger distance is calculated according to the maximum action speed of the safety clamp to be tested, and the sleeve is fixed at a position of a theoretical trigger distance above the blocking part, and the device is started, and the cage free fall will fall with the traction rod and the first traction section, and when the sleeve located on the first traction section falls to the blocking part, the sleeve will be limited downward by the blocking part, and at this time, the sleeve rubs against the first traction section, so the falling speed of the first traction section will be less than the falling speed of the cage, and the lifting rod is lifted upward under the action of the pulling force of the first traction section, thereby triggering the safety clamp to be tested. The technical solution of the present invention triggers the lifting rod located at a high altitude through the joint action of the sleeve and the blocking part set at a low place, thereby improving the problem that the existing elevator progressive safety clamp free fall test trigger device needs to adjust the sleeve at a high altitude, which has safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 A structural schematic diagram of an embodiment of a trigger device for a free fall test of a progressive safety clamp for an elevator provided by the present invention; Figure 2 for Figure 1 A schematic cross-sectional view of the middle sleeve; Figure 3 A schematic flow chart of an embodiment of a triggering method for a free fall test of a progressive safety clamp of an elevator provided by the present invention.

[0019] Description of Figure Numbers: 100. Elevator progressive safety clamp free fall test trigger device; 1. Pulley assembly; 11. Upper pulley; 12. Lower pulley; 2. Traction rope; 21. First traction section; 3. Fixed part; 4. Sleeve; 41. Inner sleeve; 42. Outer sleeve; 5. Blocking part; 6. Screw hole; 7. Lifting rod; 8. Cage.

[0020] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] At present, the free fall test of progressive safety clamps is generally carried out in the elevator test tower. The conventional test method is to install the progressive safety clamp under the test cage, and the test cage can move up and down along the fixed guide rail in the test tower. Before the test starts, the cage is lifted to a certain height and allowed to fall freely. When the designed maximum action speed is reached, the trigger device starts the safety clamp lifting mechanism, thereby causing the safety clamp to act.

[0025] Among the many triggering methods, a common triggering device is to fix the wire rope at the top and bottom of the test shaft, and install a sleeve that can slide frictionally on the wire rope. The friction force of the sleeve is set to be equal to the force applied to the control rope by the speed limiter corresponding to the safety clamp being tested, that is, the sleeve will be fixed on the wire rope by static friction. Before the test, the position of the sleeve under the lifting mechanism is determined according to the falling speed of the cage. During the free fall of the cage, the lifting mechanism falls along the wire rope with the cage. When the lifting mechanism reaches the sleeve position, it will collide with the sleeve. Under the upward force of the sleeve, the lifting mechanism is lifted upward relative to the cage, thereby triggering the action of the safety clamp.

[0026] However, in the safety clamp test of ultra-high-speed and heavy-load elevators, this traditional triggering method exposed many problems. Due to the high action speed of ultra-high-speed and heavy-load safety clamps, the free fall distance and braking distance are extremely long. Taking the safety clamp with a rated speed of 8m / s as an example, the distance can reach 25m. This requires the sleeve to be installed at a very high position, which not only increases the risk of high-altitude operations, but also makes it extremely inconvenient to adjust the friction between the sleeve and the wire rope at high altitudes, and it is difficult to control accurately. This kind of high-altitude working environment is complex, and the technical level and safety guarantee requirements of the operator are extremely high. Once the operation is wrong, it may cause serious safety accidents.

[0027] The present invention provides a free-fall test trigger device 100 for a progressive safety clamp of an elevator, which uses a test cage equipped with weights to simulate an elevator for testing.

[0028] See also Figure 1 In one embodiment of the present invention, the elevator progressive safety clamp free fall test trigger device 100 includes a pulley assembly 1, a traction rope 2, a fixing portion 3, a sleeve 4 and a blocking portion 5; wherein the pulley assembly 1 includes an upper pulley 11 and a lower pulley 12 arranged at intervals in the upper and lower directions; the traction rope 2 is configured as a ring and is sleeved between the upper pulley 11 and the lower pulley 12, and the traction rope 2 has a first traction section 21; the fixing portion 3 is fixedly arranged on the first traction section 21 of the traction rope 2 so as to be able to move along with the traction rope 2 The fixing portion 3 is used to be fixed to one end of the lifting rod 7; the sleeve 4 is sleeved on the first traction section 21 of the traction rope 2 and is fixed to the traction rope 2 by static friction, the sleeve 4 is located at the lower end of the fixing portion 3, and a gap is reserved between the sleeve 4 and the lower end of the first traction section 21; the blocking portion 5 is located below the sleeve 4 and is limited, so as to resist the sleeve 4 when the sleeve 4 moves downward with the first traction section 21, so as to limit the sleeve 4 from continuing to move downward with the first traction section 21.

[0029] When the technical solution of the present invention is in use, the device is first adjusted so that the traction rope 2 is in a tensioned state, and then one end of the lifting rod 7 of the safety clamp installed at the bottom of the cage 8 is fixed to the fixed part 3, and the cage 8 is moved to a high place, and then the theoretical trigger distance is calculated according to the maximum action speed designed for the safety clamp to be tested, and the sleeve 4 is fixedly set at a position of a theoretical trigger distance above the blocking part 5, and the device is started. The cage 8 will fall freely with the traction rod and the first traction section 21. When the sleeve 4 located on the first traction section 21 falls to the blocking part 5, the sleeve 4 will be limited downward by the blocking part 5. At this time, the sleeve 4 rubs against the first traction section 21, so the falling speed of the first traction section 21 will be less than the falling speed of the cage 8, and the lifting rod 7 is lifted upward under the action of the pulling force of the first traction section 21, thereby triggering the safety clamp to be tested. The technical solution of the present invention triggers the lifting rod 7 located at a high altitude through the combined action of the sleeve 4 and the blocking part 5 arranged at a low position, thereby improving the problem that the existing elevator progressive safety clamp free fall test trigger device 100 needs to adjust the sleeve 4 at a high altitude, which poses a safety hazard.

[0030] In order to ensure that the blocking portion 5 does not exert too much resistance on the first traction segment 21 when the first traction segment 21 moves downward, and can resist the downward movement of the sleeve 4, in the embodiment of the present invention, the blocking portion 5 is movably sleeved with the first traction segment 21. Specifically, the blocking portion 5 is provided with a through hole, and the traction rope 2 is arranged through the through hole, and the diameter of the through hole is smaller than the diameter of the sleeve 4. In this way, the traction rope 2 will not be exerted with too much resistance by the blocking portion 5 when sliding, and the function of resisting the downward movement of the sleeve 4 can be achieved.

[0031] When the elevator progressive safety clamp free fall test trigger device 100 is in operation, the traction rope 2 will apply a relative force to the pulley assembly 1. In order to prevent the pulley assembly 1 from being over-pressured during operation, in an embodiment of the present invention, at least one of the upper pulley 11 and the lower pulley 12 is elastically mounted by an elastic member, and the elastic member enables at least one of the upper pulley 11 and the lower pulley 12 to be elastically reset in a direction away from the other. The setting of the elastic member can not only prevent the pulley assembly 1 from being over-pressured during operation, but also ensure that the elastically mounted pulley adjusts the distance from the other pulley according to its own pressure during operation, so that the traction rope 2 always maintains the best tension state. It should be noted that the present invention does not limit whether the elastically mounted pulley is the upper pulley 11 or the lower pulley 12. In another embodiment of the present invention, both the upper pulley 11 and the lower pulley 12 are elastically mounted to reduce the pressure of the two pulleys during operation.

[0032] It should be noted that the present invention does not limit the specific form of the elastic member. In the embodiment of the present invention, the elastic member includes a spring, one end of which is fixedly arranged, and the other end is connected to the lower pulley 12; the upper pulley 11 is fixedly installed. This installation method is more convenient and safe when the device is inspected and repaired because the lower pulley 12 at a low position is elastically installed and the upper pulley 11 at a high position is fixedly installed. It should be noted that the present invention does not limit the location where the spring is fixedly arranged. In the embodiment of the present invention, one end of the spring is connected to the blocking portion 5, and the other end is connected to the lower pulley 12.

[0033] See also Figure 2 During the test, the sleeve 4 needs to have a large friction force on the traction rope 2 and also needs to collide with the blocking portion 5. In order to achieve these functions, in the embodiment of the present invention, the sleeve 4 includes: an inner sleeve 41 and an outer sleeve 42; wherein the inner sleeve 41 is sleeved on the periphery of the first traction section 21 and fixed to the inner sleeve 41 by static friction, and the outer sleeve 42 is sleeved on the periphery of the inner sleeve 41. In this way, when the sleeve 4 collides with the blocking portion 5, the outer sleeve 42 can fix the position of the inner sleeve 41 through its own structure without changing, so as to ensure that the inner sleeve 41 rubs the traction rope 2. At the same time, the two functions of the sleeve 4 are achieved by using different parts, and the damaged corresponding part can be replaced during maintenance.

[0034] In the embodiment of the present invention, the sleeve 4 includes two semi-cylindrical bodies, which are combined to form the sleeve 4. Such a configuration not only provides convenience when installing the sleeve 4, but also allows direct observation of the friction of the inner sleeve 41 by simply disassembling the sleeve 4 during maintenance, thus facilitating maintenance by the staff.

[0035] If the friction between the sleeve 4 and the traction rope 2 is too large, it will cause greater wear on the inner sleeve 41 and the traction rope 2. If the friction is too small, the deceleration effect on the first traction section 21 is not obvious, which may cause the lifting rod 7 to fail to be lifted smoothly. Therefore, when installing the sleeve 4, the friction between the sleeve 4 and the traction rope 2 needs to be adjusted. Figure 2 In the embodiment of the present invention, the two semi-cylindrical bodies are screwed and fixed by screwing. Specifically, the two semi-cylindrical bodies are each provided with four screw holes 6, so that the friction force of the sleeve 4 on the traction rope 2 can be adjusted by adjusting the tightness of the screwing members passing through the screw holes 6 of the sleeve 4.

[0036] It should be noted that the present invention does not limit the materials of the inner sleeve 41 and the outer sleeve 42, as long as the corresponding functions can be achieved. In the embodiment of the present invention, the material of the inner sleeve 41 is nylon, and the material of the outer sleeve 42 is iron. Since the inner sleeve 41 needs to rub against the traction rope 2, wear-resistant nylon material is selected. The outer sleeve 42 needs to collide with the blocking part 5 and ensure that it does not deform under the pressure of the blocking part 5 after the collision, so iron with greater rigidity is selected.

[0037] See also Figure 3 The present invention also proposes a triggering method for a free fall test of a progressive safety clamp of an elevator, the triggering method for a free fall test of a progressive safety clamp of an elevator comprising the following steps: S100: Provide an elevator progressive safety clamp free fall test trigger device 100; S200: Fix one end of the lifting rod 7 of the safety clamp installed at the bottom of the cage 8 to the fixing part 3, and move the cage 8 to a high place; S300: moving the sleeve 4 to a set position on the first traction section 21, wherein the set position is obtained according to a theoretical triggering distance of the safety clamp; S400: The cage 8 is in free fall, and the sleeve 4 moves downward along with the cage 8 to the blocking portion 5 and is limited downward by the blocking portion 5. The sleeve 4 applies an upward friction force to the first traction segment 21, so that the downward speed of the first traction segment 21 and the fixed portion 3 is less than the falling speed of the cage 8, and the lifting rod 7 is lifted to trigger the safety clamp.

[0038] Specifically, the triggering method of the free fall test of the progressive safety clamp of the elevator is applicable to the triggering device 100 of the free fall test of the progressive safety clamp of the elevator in the above embodiment. Then, one end of the lifting rod 7 of the safety clamp installed at the bottom of the cage 8 is fixed to the fixed part 3, and the cage 8 is moved to a high place. This step is to reserve a sufficient height to stop the cage 8 after the safety clamp is triggered. Then, by calculating the theoretical triggering distance required for the safety clamp to be triggered, the sleeve 4 is set at a preset position on the first traction section 21 according to the theoretical triggering distance. After the preparation is completed, the test can be started, and the cage 8 is allowed to fall freely. When the sleeve 4 is limited downward by the blocking part 5, the sleeve 4 rubs the traction rope 2, so that the falling speed of the fixed part 3 is less than the falling speed of the cage 8, so that the lifting rod 7 is lifted to trigger the safety clamp. After that, the safety clamp will clamp the guide rail of the cage 8, and the cage 8 will be stopped by the friction between the safety clamp and the guide rail of the cage 8. The triggering method of the elevator progressive safety clamp free fall test trigger device 100 triggers the lifting rod 7 located at a high altitude through the joint action of the sleeve 4 and the blocking part 5 arranged at a low position, thereby improving the problem that the existing elevator progressive safety clamp free fall test trigger device 100 needs to adjust the sleeve 4 at a high altitude, which poses a safety hazard.

[0039] Since the common material of the traction rope 2 is a steel wire rope, during the test, the traction rope 2 will be stretched due to the large tension during use, so the tension of the traction rope 2 needs to be adjusted each time the test is performed. In the embodiment of the present invention, before the step of "fixing one end of the lifting rod 7 of the safety clamp installed at the bottom of the cage 8 to the fixing part 3 and running the cage 8 to a high place", it also includes: adjusting the length of the traction rope 2. The tension of the traction rope 2 can be adjusted by adjusting the length of the traction rope 2, which is convenient to operate.

[0040] It should be noted that there are many ways for the adjustment device to make the traction rope 2 in a tensioned state, and the present invention does not limit this. In another embodiment of the present invention, before the step of "fixing one end of the lifting rod 7 of the safety clamp installed at the bottom of the cage 8 to the fixing part 3 and running the cage 8 to a high place", it also includes: adjusting the distance between the upper pulley 11 and the lower pulley 12. In this embodiment, the tension of the traction rope 2 is adjusted by adjusting the distance between the upper pulley 11 and the lower pulley 12.

[0041] In an embodiment of the present invention, the sleeve 4 is moved to a set position on the first traction section 21, and the set position is obtained according to the theoretical trigger distance of the safety clamp, wherein the theoretical trigger distance S=V 2 / 2a, V is the maximum action speed of the safety clamp, and a is the acceleration of the cage 8 during free fall. It should be noted that since the resistance of the cage 8 during falling is affected by many factors, a is replaced by the gravitational acceleration g in theoretical calculation.

[0042] In an embodiment of the present invention, the sleeve 4 is moved to a set position on the first traction section 21, and the set position is obtained according to the theoretical trigger distance of the safety clamp, including: moving the sleeve 4 to a position above the blocking portion 5 at a theoretical trigger distance. Specifically, since the acceleration a of the cage 8 during free fall is approximately replaced by the gravity acceleration g when calculating the theoretical trigger distance S in the above embodiment, in order to reduce the error, in actual operation, the sleeve 4 is set at a position slightly higher than the theoretical trigger distance above the blocking portion 5, and the specific adjustment is based on the actual measured value.

[0043] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A free fall test trigger device for progressive safety clamps of elevators, characterized in that: include: The pulley assembly comprises an upper pulley and a lower pulley which are spaced apart from each other; A traction rope is arranged in a ring shape and is sleeved between the upper pulley and the lower pulley, and the traction rope has a first traction section; A fixing part, fixedly arranged on the first traction section of the traction rope so as to be able to move up and down along with the traction rope, and the fixing part is used to be fixed to one end of the lifting rod; a sleeve, which is sleeved on the first traction section of the traction rope and fixed to the traction rope by static friction, wherein the sleeve is located at the lower end of the fixing portion and a spacing is reserved between the sleeve and the lower end of the first traction section; and, The blocking portion is located below the sleeve and is limited in position, so as to resist the sleeve when the sleeve moves downward along with the first traction section, so as to limit the sleeve from continuing to move downward along with the first traction section.

2. The elevator progressive safety clamp free fall test trigger device according to claim 1, characterized in that: The blocking portion is movably sleeved with the first traction section.

3. The elevator progressive safety clamp free fall test trigger device according to claim 1, characterized in that: At least one of the upper pulley and the lower pulley is elastically mounted via an elastic member, and the elastic member enables at least one of the upper pulley and the lower pulley to elastically reset in a direction away from the other.

4. The elevator progressive safety clamp free fall test trigger device according to claim 3, characterized in that: The elastic member comprises a spring, one end of which is fixedly arranged, and the other end of which is connected to the lower pulley; The upper pulley is fixedly installed.

5. The elevator progressive safety clamp free fall test trigger device according to claim 1, characterized in that: The sleeve comprises: an inner sleeve, which is sleeved on the periphery of the first traction section and fixed to the inner sleeve by static friction; and, The outer sleeve is sleeved on the outer periphery of the inner sleeve.

6. The elevator progressive safety clamp free fall test trigger device according to claim 1 or 5, characterized in that: The sleeve comprises two semi-cylindrical bodies, and the semi-cylindrical bodies are combined to form the sleeve.

7. The elevator progressive safety clamp free fall test trigger device according to claim 6, characterized in that: The two semi-cylinders are screwed and fixed via screw connectors.

8. The elevator progressive safety gear free fall test triggering device according to claim 5, characterized in that: The material of the inner sleeve is nylon, and the material of the outer sleeve is iron.

9. A triggering method for a free fall test of a progressive safety clamp of an elevator, characterized in that: The triggering method of the elevator progressive safety gear free fall test comprises the following steps: Provide an elevator progressive safety clamp free fall test trigger device as described in any one of claims 1 to 8; Fix one end of the lifting rod of the safety clamp installed at the bottom of the cage to the fixing part, and move the cage to a high place; Moving the sleeve to a set position on the first traction section, wherein the set position is obtained according to a theoretical triggering distance of the safety clamp; The cage is in free fall, and the sleeve moves downward along with the cage to the blocking part and is limited downward by the blocking part. The sleeve applies an upward friction force to the first traction section, so that the downward speed of the first traction section and the fixed part is less than the falling speed of the cage, and the lifting rod is lifted to trigger the safety clamp.

10. The triggering method of the free fall test of the progressive safety gear of an elevator according to claim 9, characterized in that: The sleeve is moved to a set position on the first traction section, wherein the set position is obtained according to the theoretical trigger distance of the safety clamp, wherein the theoretical trigger distance S=V 2 / 2a, V is the maximum action speed of the safety clamp, and a is the acceleration of the cage during free fall.

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