Progressive safety gear free fall test trigger device and trigger method for elevator

Abstract

The present invention discloses a triggering device and a triggering method for a free-fall test of an elevator progressive safety gear, which relates to the technical field of elevator testing. The triggering device for the free-fall test of the elevator progressive safety gear includes a pulley assembly, a traction rope, a fixing part, a sleeve and a blocking part; the pulley assembly includes an upper pulley and a lower pulley; the traction rope is sleeved between the upper pulley and the lower pulley, and the traction rope has a first traction section; the fixing part is fixedly arranged on the first traction section so as to be able to move up and down along with the traction rope, and the fixing part is used for fixing one end of the lifting rod; the sleeve is sleeved on the first traction section and is fixed to the traction rope through static friction. The sleeve is located below the fixing part, and a spacing is reserved between the sleeve and the lower end of the first traction section; the blocking part is located below the sleeve and is limited, and is used for resisting the sleeve when the sleeve moves downward along with the first traction section. The technical solution provided by the present invention can solve the problem that the existing device needs to adjust the sleeve at high altitude, which poses a safety hazard.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator testing, and particularly to a triggering device and a triggering method for a free fall test of an elevator progressive safety gear. Background Art

[0002] Currently, the free fall test of the progressive safety gear is generally carried out in an elevator test tower. The conventional test method is to install the progressive safety gear 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 then allowed to free fall. When the maximum designed operating speed is reached, the triggering device activates the safety gear lifting mechanism, and then the safety gear operates.

[0003] Among many triggering methods, a common triggering device is to fix steel wires at the top and bottom of the test shaft and install a sleeve that can slide frictionally on the steel wires. The frictional force of the sleeve is set to be equal to the force exerted by the speed governor corresponding to the safety gear to be tested on the operating rope, that is to say, the sleeve will be fixed on the steel wire 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 steel wire with the cage. When the lifting mechanism reaches the position of the sleeve, it will collide with the sleeve. Under the upward force of the sleeve, the lifting mechanism is lifted upward relative to the cage, thus triggering the operation of the safety gear.

[0004] However, in the safety gear test of ultra-high-speed and large-capacity elevators, many problems are exposed in this traditional triggering method. Due to the high operating speed of the ultra-high-speed and large-capacity safety gear, the free fall distance and braking distance are extremely long. Taking a safety gear with a rated speed of 8 m / s as an example, this distance can reach 25 m. This results in the sleeve needing 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 frictional force between the sleeve and the steel wire at high altitude, and it is difficult to accurately control. This high-altitude operation environment is complex, and the technical level and safety guarantee requirements for operators are extremely high. Once an operation error occurs, serious safety accidents may be caused. Summary of the Invention

[0005] The main object of the present invention is to propose a triggering device and a triggering method for a free fall test of an elevator progressive safety gear, aiming to improve the problem that the existing triggering device for the free fall test of an elevator progressive safety gear needs to adjust the sleeve at high altitude, which has potential safety hazards.

[0006] To achieve the above object, a triggering device for a free fall test of an elevator progressive safety gear proposed by the present invention includes:

[0007] A pulley assembly, including an upper pulley and a lower pulley arranged at intervals up and down;

[0008] The towing rope is set as a loop and sleeved between the upper pulley and the lower pulley. The towing rope has a first towing section;

[0009] The fixing part is fixedly arranged on the first towing section of the towing rope so as to be able to move up and down along with the towing rope. The fixing part is used for fixing one end of the lifting rod;

[0010] The sleeve is sleeved on the first towing section of the towing rope and is fixed to the towing rope through static friction. The sleeve is located at the lower end of the fixing part, and a distance is reserved between the sleeve and the lower end of the first towing section; and,

[0011] The blocking part is located below the sleeve and is limited. When the sleeve moves downward along with the first towing section, the blocking part resists the sleeve to limit the sleeve from continuing to move downward along with the first towing section.

[0012] In an embodiment, the blocking part is movably sleeved with the first towing section.

[0013] In an embodiment, at least one of the upper pulley and the lower pulley is elastically installed through an elastic member. 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.

[0014] In an embodiment, the elastic member includes a spring. One end of the spring is fixedly arranged, and the other end is connected to the lower pulley;

[0015] The upper pulley is fixedly installed.

[0016] In an embodiment, the sleeve includes:

[0017] The inner sleeve is sleeved on the periphery of the first towing section and is fixed to the inner sleeve through static friction; and,

[0018] The outer sleeve is sleeved on the periphery of the inner sleeve.

[0019] In an embodiment, the sleeve includes two semi-cylindrical bodies, and the semi-cylindrical bodies are combined to form the sleeve.

[0020] In an embodiment, the two semi-cylindrical bodies are fixedly screwed through a screw member.

[0021] In an embodiment, the material of the inner sleeve is nylon, and the material of the outer sleeve is iron.

[0022] The present invention also provides a triggering method for a free fall test of an elevator progressive safety gear. The triggering method for the free fall test of the elevator progressive safety gear includes the following steps:

[0023] Provide the free fall test trigger device for the elevator progressive safety clamp as described in any of the above items;

[0024] 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 position;

[0025] Move the sleeve to a set position on the first traction section, and the set position is obtained according to the theoretical trigger distance of the safety clamp;

[0026] The cage falls freely, the sleeve moves downward with the cage to the blocking part and is limited downward by the blocking part. The sleeve exerts an upward frictional force on the first traction section, so that the downward speed of the first traction section and the fixing part is less than the falling speed of the cage, and the lifting rod is lifted to trigger the safety clamp.

[0027] In an embodiment, in the step of moving the sleeve to a set position on the first traction section, and the set position is obtained according to the theoretical trigger distance of the safety clamp, the theoretical trigger distance S = V 2 / 2a, where V is the maximum operating speed designed for the safety clamp, and a is the acceleration when the cage falls freely.

[0028] When the technical solution of the present invention is used, first adjust the device to make the traction rope in a tensioned state, then 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 position. Then calculate the theoretical trigger distance according to the maximum operating speed designed for the safety clamp to be tested. After fixing the sleeve at a position of one theoretical trigger distance above the blocking part, start the device. The cage falling freely will drive the traction rod and the first traction section to fall. When the sleeve located on the first traction section falls to the blocking part, the sleeve will be limited downward by the blocking part. At this time, the sleeve and the first traction section rub against each other. Therefore, the falling speed of the first traction section will be less than the falling speed of the cage. 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 combined action of the sleeve and the blocking part arranged at a low altitude, thereby improving the problem that the existing free fall test trigger device for the elevator progressive safety clamp needs to adjust the sleeve at a high altitude, which has potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0030] Figure 1 Schematic structural diagram of an embodiment of the free-fall test triggering device for an elevator progressive safety gear provided by the present invention;

[0031] Figure 2 is Figure 1 Schematic cross-sectional structure diagram of the middle sleeve;

[0032] Figure 3 Schematic flow chart of an embodiment of the triggering method for the free-fall test of an elevator progressive safety gear provided by the present invention.

[0033] Explanation of the reference numerals in the drawings:

[0034] 100. Free-fall test triggering device for elevator progressive safety gear; 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. Pull rod; 8. Suspension cage.

[0035] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0038] 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 for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] Currently, the free-fall test of progressive safety gears is generally carried out in an elevator test tower. The conventional test method is to install the progressive safety gear 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 then allowed to free-fall. When the maximum designed operating speed is reached, the triggering device activates the safety gear lifting mechanism, and then the safety gear operates.

[0040] Among many triggering methods, a common triggering device is to fix steel wires at the top and bottom of the test shaft and install a sleeve that can frictionally slide on the steel wires. The frictional force of the sleeve is set to be equal to the force exerted by the speed governor corresponding to the safety gear to be tested on the operating rope, that is to say, the sleeve will be fixed on the steel wire by static frictional force. Before the test, the position of the sleeve below 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 steel wire with the cage. When the lifting mechanism reaches the position of the sleeve, it will collide with the sleeve. Under the upward force of the sleeve, the lifting mechanism is lifted upward relative to the cage, thus triggering the operation of the safety gear.

[0041] However, in the safety gear test of ultra-high-speed and large-load elevators, many problems are exposed in this traditional triggering method. Due to the high operating speed of the ultra-high-speed and large-load safety gear, the free-fall distance and braking distance are extremely long. Taking the safety gear with a rated speed of 8 m / s as an example, this distance can reach 25 m. This results in the sleeve needing to be installed at a very high position, which not only increases the risk of working at heights, but also makes it extremely inconvenient to adjust the frictional force between the sleeve and the steel wire at high altitudes and difficult to accurately control. This complex working environment at heights requires extremely high technical levels and safety guarantees for operators. Once an operation error occurs, serious safety accidents may be caused.

[0042] The present invention proposes a triggering device 100 for the free-fall test of an elevator progressive safety gear, and uses a test cage equipped with weights to simulate an elevator for the test.

[0043] Please refer to Figure 1 In an embodiment of the present invention, the free fall test triggering device 100 of the elevator progressive safety gear includes a pulley assembly 1, a towing rope 2, a fixing part 3, a sleeve 4 and a blocking part 5; wherein, the pulley assembly 1 includes an upper pulley 11 and a lower pulley 12 which are arranged at intervals up and down; the towing rope 2 is arranged in a loop and sleeved between the upper pulley 11 and the lower pulley 12, and the towing rope 2 has a first towing section 21; the fixing part 3 is fixedly arranged on the first towing section 21 of the towing rope 2 so as to be able to move up and down along with the towing rope 2, and the fixing part 3 is used for fixing one end of a lifting rod 7; the sleeve 4 is sleeved on the first towing section 21 of the towing rope 2 and is fixed to the towing rope 2 through static friction, the sleeve 4 is located below the fixing part 3, and a distance is reserved between the sleeve 4 and the lower end of the first towing section 21; the blocking part 5 is located below the sleeve 4 and is limited, and is used for resisting the sleeve 4 when the sleeve 4 moves downward along with the first towing section 21, so as to limit the sleeve 4 from continuing to move downward along with the first towing section 21.

[0044] When the technical solution of the present invention is in use, first adjust the device so that the towing rope 2 is in a tensioned state, then fix one end of the lifting rod 7 of the safety gear installed at the bottom of the cage 8 to the fixing part 3, and move the cage 8 to a high place. Then, calculate the theoretical triggering distance according to the maximum operating speed designed for the safety gear to be tested. After fixing the sleeve 4 at a position of one theoretical triggering distance above the blocking part 5, start the device. When the cage 8 falls freely, it will drive the towing rod and the first towing section 21 to fall. When the sleeve 4 on the first towing 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 towing section 21. Therefore, the falling speed of the first towing 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 towing section 21, thereby triggering the safety gear to be tested. The technical solution of the present invention triggers the lifting rod 7 at a high altitude through the combined action of the sleeve 4 and the blocking part 5 arranged at a low altitude, thereby improving the problem that the existing free fall test triggering device 100 of the elevator progressive safety gear needs to adjust the sleeve 4 at a high altitude, which has potential safety hazards.

[0045] In order to ensure that when the first traction section 21 moves downward, the blocking portion 5 does not exert too much resistance on the first traction section 21, and at the same time can resist the downward movement of the sleeve 4. In an embodiment of the present invention, the blocking portion 5 is movably sleeved on the first traction section 21. Specifically, the blocking portion 5 is provided with a through hole, and the traction rope 2 is arranged through the through hole. The diameter of the through hole is smaller than the diameter of the sleeve 4. In this way, it can be ensured that the traction rope 2 will not be subjected to too much resistance when sliding, and the function of resisting the downward movement of the sleeve 4 can also be realized.

[0046] When the elevator progressive safety gear free fall test trigger device 100 is in operation, the traction rope 2 will exert a relative force on the pulley assembly 1. In order to prevent the pressure on the pulley assembly 1 from being too large during operation, in an embodiment of the present invention, at least one of the upper pulley 11 and the lower pulley 12 is elastically installed through an elastic member. The elastic member enables at least one of the upper pulley 11 and the lower pulley 12 to elastically reset in a direction away from the other. The setting of the elastic member can not only prevent the pressure on the pulley assembly 1 from being too large during operation, but also ensure that during operation, the elastically installed pulley adjusts the distance from the other pulley according to its own pressure, 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 installed 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 installed to reduce the pressure on the two pulleys during operation.

[0047] It should be noted that the present invention does not limit the specific form of the elastic member. In an embodiment of the present invention, the elastic member includes a spring. One end of the spring 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 for overhauling the device because the lower pulley 12 is elastically installed and the upper pulley 11 at a higher position is fixedly installed. It should be noted that the present invention does not limit the position where the spring is fixedly arranged. In an 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.

[0048] Please refer to Figure 2, during the test, the sleeve 4 needs to have a large frictional force on the traction rope 2 and also needs to collide with the blocking part 5. 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 is fixed thereto 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 part 5, the outer sleeve 42 can fix the position of the inner sleeve 41 without change through its own structure to ensure that the inner sleeve 41 rubs the traction rope 2. At the same time, by using different parts to achieve the two functions of the sleeve 4, only the damaged corresponding part needs to be replaced during maintenance.

[0049] In the embodiment of the present invention, the sleeve 4 includes two semi-cylindrical bodies, and the semi-cylindrical bodies are combined to form the sleeve 4. Such a setting not only provides convenience in installing the sleeve 4, but also, during maintenance, only by disassembling the sleeve 4 can the friction condition of the inner sleeve 41 be directly observed, which is convenient for the staff to carry out maintenance.

[0050] If the frictional force between the sleeve 4 and the traction rope 2 is too large, it will cause greater wear to the inner sleeve 41 and the traction rope 2. If the frictional force is too small, the deceleration effect on the first traction section 21 is not obvious, which may cause the lifting rod 7 not to be lifted smoothly. Therefore, when installing the sleeve 4, it is necessary to adjust the frictional force between the sleeve 4 and the traction rope 2. Please refer to Figure 2 , in the embodiment of the present invention, the two semi-cylindrical bodies are fixedly connected by a screwing member. Specifically, four screw holes 6 are provided on each of the two semi-cylindrical bodies. In this way, the frictional force between the sleeve 4 and the traction rope 2 can be adjusted by adjusting the tightness of the screwing member passing through the screw holes 6 of the sleeve 4.

[0051] 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 at the same time ensure that it can withstand the pressure of the blocking part 5 without deformation after the collision, so iron with a relatively large stiffness is selected.

[0052] Please refer to Figure 3 , the present invention also proposes a triggering method for the free fall test of an elevator progressive safety gear, and the triggering method for the free fall test of the elevator progressive safety gear includes the following steps:

[0053] S100: Provide the free fall test trigger device 100 for the elevator progressive safety gear;

[0054] S200: Fix one end of the pull rod 7 of the safety gear installed at the bottom of the cage 8 to the fixing part 3, and move the cage 8 to a high position;

[0055] S300: Move the sleeve 4 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 gear;

[0056] S400: The cage 8 free falls, and the sleeve 4 moves downward with the cage 8 to the blocking part 5 and is limited downward by the blocking part 5. The sleeve 4 exerts an upward frictional force on the first traction section 21, so that the downward speed of the first traction section 21 and the fixing part 3 is less than the falling speed of the cage 8, and the pull rod 7 is lifted to trigger the safety gear.

[0057] Specifically, the trigger method for the free fall test of the elevator progressive safety gear is applicable to the free fall test trigger device 100 for the elevator progressive safety gear in the above embodiment. Then fix one end of the pull rod 7 of the safety gear installed at the bottom of the cage 8 to the fixing part 3, and move the cage 8 to a high position. This step is to reserve a sufficient height for the cage 8 to stop after triggering the safety gear. After that, calculate the theoretical trigger distance required for the safety gear to trigger, and then set the sleeve 4 at a preset position on the first traction section 21 according to the theoretical trigger distance. After preparation, the test can be started, making the cage 8 free fall. When the sleeve 4 is limited downward by the blocking part 5, the sleeve 4 frictions the traction rope 2, so that the falling speed of the fixing part 3 is less than the falling speed of the cage 8, making the pull rod 7 lifted to trigger the safety gear. After that, the safety gear will clamp the guide rail of the cage 8, and the cage 8 is stopped by the frictional force between the safety gear and the guide rail of the cage 8. The trigger method of the free fall test trigger device 100 for the elevator progressive safety gear triggers the pull rod 7 at a high altitude through the combined action of the sleeve 4 and the blocking part 5 arranged at a low altitude, thus improving the problem that the existing free fall test trigger device 100 for the elevator progressive safety gear needs to adjust the sleeve 4 at a high altitude, which has potential safety hazards.

[0058] Since the common material of the traction rope 2 is steel wire rope, during the test, the traction rope 2 will elongate due to the large tensile force during use. Therefore, it is necessary to adjust the tension of the traction rope 2 every time a test is carried out. In the embodiment of the present invention, before the step of "fixing one end of the pull rod 7 of the safety tongs installed at the bottom of the cage 8 to the fixing part 3 and running the cage 8 to a high place", it further includes: adjusting the length of the traction rope 2. By adjusting the length of the traction rope 2 to adjust the tension of the traction rope 2, the operation is convenient.

[0059] It should be noted that there are many methods for the adjusting 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 pull rod 7 of the safety tongs installed at the bottom of the cage 8 to the fixing part 3 and running the cage 8 to a high place", it further 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.

[0060] In the embodiment of the present invention, in the step of moving the sleeve 4 to a set position on the first traction section 21, where the set position is obtained according to the theoretical triggering distance of the safety tongs, the theoretical triggering distance S = V 2 / 2a, where V is the maximum operating speed designed for the safety tongs, and a is the acceleration of the cage 8 during free fall. It should be noted that since the resistance during the fall of the cage 8 is affected by many factors, when calculating theoretically, a is replaced by the gravitational acceleration g.

[0061] In the embodiment of the present invention, the step of moving the sleeve 4 to a set position on the first traction section 21, where the set position is obtained according to the theoretical triggering distance of the safety tongs, includes: moving the sleeve 4 to a position one theoretical triggering distance above the blocking part 5. Specifically, since in the above embodiment, the acceleration a of the cage 8 during free fall is approximately replaced by the gravitational acceleration g when calculating the theoretical triggering distance S, in order to reduce the error, in actual operation, the sleeve 4 is set at a position slightly higher than one theoretical triggering distance above the blocking part 5, and is adjusted specifically according to the actually measured value.

[0062] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is 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 triggering 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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