Elevator buffer

Abstract

The elevator buffer comprises a base, a pressure cylinder is arranged on the base and used for containing hydraulic oil, a plunger assembly is movably inserted into the pressure cylinder, and an exhaust hole and a throttling hole are formed in the top and the bottom of the plunger assembly correspondingly; the bottom of the pressure cylinder is fixedly connected with an adjusting rod, the free end of the adjusting rod extends into the plunger assembly through the throttling hole in the vertical direction and is connected with a positioning block, and the positioning block can abut against the bottom of the plunger assembly to limit the plunger assembly. The top end of the elastic piece is fixed to the top of the plunger assembly, and the bottom end of the elastic piece is fixed to the top of the pressure cylinder. A dilatation area and a straight barrel area are arranged in the plunger assembly, and the diameter of the dilatation area is larger than that of the straight barrel area; the upper portion of the plunger assembly is arranged to be the expansion area with the diameter larger than that of the lower portion, so that the plunger assembly can have a lower height under the condition that the plunger assembly and an original structure have the same volume, the depth of a pit space can be effectively reduced while the performance is ensured, and the manufacturing and installing cost of an elevator is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of elevator equipment, and particularly relates to an elevator buffer. Background Art

[0002] An elevator buffer is an important safety component of elevator equipment. It is used to protect when the elevator car is in danger of falling, buffer the people in the elevator car, and improve the safety performance of the elevator. Usually, when the car falls, it impacts the plunger assembly and makes it move downward, compressing the oil in the oil cylinder, transferring the kinetic energy of the elevator to the hydraulic oil in the pressure cylinder, and making the hydraulic oil spray into the plunger assembly through the annular throttle hole. When the hydraulic oil passes through the annular throttle hole, due to the sudden reduction of the flow area, eddies are formed, and the particles in the liquid collide and rub against each other to generate heat, consuming the impact kinetic energy of the elevator, so as to ensure that the elevator decelerates and stops safely and reliably.

[0003] When the elevator buffer works, the hydraulic oil sprays into the plunger assembly through the throttle hole, and the plunger assembly will bear huge pressure. The larger the volume of the plunger assembly, the larger the space for the buffer to absorb impact energy. Therefore, most of the existing buffers have a relatively high height. Since the buffer needs to be installed in the pit space, its height also limits the depth of the pit space. The deep pit space of the elevator shaft leads to a high overall manufacturing cost of the elevator. While ensuring the product performance, reducing the product cost is an urgent problem to be solved currently. Summary of the Utility Model

[0004] The purpose of the present application is to provide an elevator buffer for the above problems, including:

[0005] A base;

[0006] A pressure cylinder, which is arranged on the base and used to hold hydraulic oil. A regulating rod is fixedly connected to the bottom of the pressure cylinder;

[0007] A plunger assembly, which is movably inserted into the pressure cylinder. An exhaust hole and a throttle hole are respectively opened at the top and bottom of the plunger assembly. The free end of the regulating rod extends into the plunger assembly along the vertical direction through the throttle hole and is connected with a positioning block, and the positioning block can abut against the bottom of the plunger assembly to limit the plunger assembly; An elastic member is sleeved outside the plunger assembly, the top end of the elastic member is fixed to the top of the plunger assembly, and the bottom end thereof is fixed to the top of the pressure cylinder; An expansion area and a straight cylinder area are provided inside the plunger assembly, and the diameter of the expansion area is larger than that of the straight cylinder area.

[0008] According to the technical solution provided by some embodiments of the present application, it further includes a switch assembly. The switch assembly is disposed on one side of the plunger assembly and is electrically connected to the elevator main machine. The switch assembly has a first state and a second state. When in the first state, the positioning block is separated from the bottom of the plunger assembly, and the elevator main machine is powered off. When in the second state, the positioning block abuts against the bottom of the plunger assembly, and the elevator main machine is powered on.

[0009] According to the technical solution provided by some embodiments of the present application, the switch assembly includes a connecting plate. The connecting plate is disposed on one side of the pressure cylinder. A trigger switch is provided on the connecting plate. The trigger switch is electrically connected to the elevator main machine. The switch assembly further includes a trigger rod. The trigger rod is fixed to the top of the plunger assembly. The free end of the trigger rod extends in the vertical direction and can contact the trigger switch when the plunger assembly moves downward, so as to power off the elevator main machine.

[0010] According to the technical solution provided by some embodiments of the present application, it further includes a sealing assembly. The sealing assembly is disposed between the outer wall of the plunger assembly and the inner wall of the pressure cylinder to prevent the hydraulic oil from leaking between the outer wall of the plunger assembly and the inner wall of the pressure cylinder.

[0011] According to the technical solution provided by some embodiments of the present application, the sealing assembly includes a first guide sleeve, a sealing ring and a second guide sleeve. The first guide sleeve, the sealing ring and the second guide sleeve are sequentially fixed on the inner wall of the pressure cylinder in the vertical direction and are in slidable contact with the outer wall of the plunger assembly.

[0012] According to the technical solution provided by some embodiments of the present application, the plunger assembly includes a plunger cylinder. The expansion area and the straight cylinder area are provided in the plunger cylinder. Buffer covers are respectively covered on the upper and lower ends of the plunger cylinder. An exhaust hole is provided in the middle of the buffer cover. An oil passage is provided on the lower end cover. A throttle ring is provided in the oil passage. Throttle holes are provided on the throttle ring.

[0013] According to the technical solution provided by some embodiments of the present application, a ring-shaped protrusion is provided on the outer wall of the top of the plunger cylinder. A spring seat is provided on the outer wall of the top of the pressure cylinder. The upper and lower ends of the elastic member respectively abut against the ring-shaped protrusion and the spring seat.

[0014] According to the technical solution provided by some embodiments of the present application, the oil passage includes a tapered section, an intermediate section and a throttle section that are sequentially connected. A retaining ring is fixed in the throttle section. The retaining ring is sleeved on the outer periphery of the adjusting rod and the throttle ring is provided thereon.

[0015] According to the technical solutions provided by certain embodiments of the present application, an oil level rod is further provided on the base, and the oil level rod is used to measure the oil level height of the hydraulic oil inside the plunger assembly.

[0016] Compared with the prior art, the beneficial effects of the present application are as follows: The present application provides an elevator buffer, including a base, on which a pressure cylinder is provided for containing hydraulic oil. A plunger assembly is movably inserted into the pressure cylinder. Exhaust holes and throttle holes are respectively provided at the top and bottom of the plunger assembly. The bottom of the pressure cylinder is fixedly connected with an adjusting rod, and the free end of the adjusting rod extends vertically into the plunger assembly through the throttle hole and is connected with a positioning block. The positioning block can abut against the bottom of the plunger assembly to limit the plunger assembly. An elastic member is sleeved on the outer periphery of the plunger assembly. The top end of the elastic member is fixed to the top of the plunger assembly, and its bottom end is fixed to the top of the pressure cylinder. The inside of the plunger assembly has an expansion area and a straight cylinder area, and the diameter of the expansion area is larger than that of the straight cylinder area. By setting the upper part of the plunger assembly as an expansion area with a diameter larger than the lower part, when the plunger assembly has the same volume as the original structure, it can have a lower height than the original structure. The same volume can enable the plunger assembly to have enough space to absorb impact energy, and at the same time, the lower height can effectively reduce the depth of the pit space, greatly reducing the manufacturing and installation costs of the elevator.

[0017] It should be understood that the description of technical features, technical solutions, beneficial effects or similar languages in the present application does not imply that all features and advantages can be achieved in any single embodiment. On the contrary, it can be understood that the description of features or beneficial effects means that at least one embodiment includes specific technical features, technical solutions or beneficial effects. Therefore, the description of technical features, technical solutions or beneficial effects in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in this embodiment can be combined in any appropriate manner. Those skilled in the art will understand that an embodiment can be implemented without one or more specific technical features, technical solutions or beneficial effects of a specific embodiment. In other embodiments, additional technical features and beneficial effects can also be identified in specific embodiments that do not embody all embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description 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 these drawings.

[0019] Figure 1 It is a schematic structural diagram of an elevator buffer provided by an embodiment of the present application;

[0020] Figure 2 Cross-sectional schematic diagram of an elevator buffer provided by an embodiment of the present application;

[0021] Figure 3 Structural schematic diagram of a plunger cylinder of an elevator buffer provided by an embodiment of the present application;

[0022] Figure 4 Schematic diagram for measuring the oil level in the plunger cylinder of an elevator buffer provided by an embodiment of the present application;

[0023] Figure 5 and Figure 6 Structural schematic diagram of an integrally formed spring seat and pressure cylinder of an elevator buffer provided by an embodiment of the present application.

[0024] The text markings in the figure are indicated as:

[0025] 1. Pressure cylinder; 2. Plunger assembly; 3. Elastic member; 4. Switch assembly; 5. Sealing assembly; 6. Oil level rod; 7. Base; 8. Spring seat; 11. Adjusting rod; 12. Positioning block; 21. Plunger cylinder; 22. Buffer cover; 23. Lower end cover; 24. Throttle ring; 25. Retaining ring; 41. Trigger switch; 42. Trigger rod; 43. Connecting plate; 51. First guide sleeve; 52. Sealing ring; 53. Second guide sleeve; 211. Expansion area; 212. Straight cylinder area; 213. Annular protrusion; 221. Exhaust hole; 231. Conical section; 232. Intermediate section; 233. Throttle section; 241. Throttle hole. Detailed implementation manners

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any restrictive effect on the protection scope of the present application. Specifically, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0028] As mentioned in the background art, in view of the problems in the prior art, this embodiment provides an elevator buffer, including:

[0029] A base 7;

[0030] A pressure cylinder 1, which is arranged on the base 7 and used for containing hydraulic oil. A regulating rod 11 is fixedly connected to the bottom of the pressure cylinder 1;

[0031] A plunger assembly 2, which is movably inserted into the pressure cylinder 1. An exhaust hole 221 and a throttle hole 241 are respectively formed at the top and bottom of the plunger assembly 2. The free end of the regulating rod 11 extends into the plunger assembly 2 along the vertical direction through the throttle hole 241 and is connected with a positioning block 12. The positioning block 12 can abut against the bottom of the plunger assembly 2 to limit the plunger assembly 2; An elastic member 3 is sleeved on the outer periphery of the plunger assembly 2. The top end of the elastic member 3 is fixed to the top of the plunger assembly 2, and its bottom end is fixed to the top of the pressure cylinder 1; The inside of the plunger assembly 2 has an expansion area 211 and a straight cylinder area 212, and the diameter of the expansion area 211 is larger than that of the straight cylinder area 212.

[0032] As Figure 2 shown, the base 7 is a cuboid platform. The pressure cylinder 1 and the plunger assembly 2 are both approximately hollow cylindrical structures. The pressure cylinder 1 is fixed on the base 7 and contains hydraulic oil inside. The top of the pressure cylinder 1 has a first open end. The plunger assembly 2 is inserted into the pressure cylinder 1 through the first open end and can reciprocate in the pressure cylinder 1 along the vertical direction; The elastic member 3 is a spring. The upper and lower ends of the spring are respectively fixed to the top of the plunger assembly 2 and the pressure cylinder 1. The regulating rod 11 is fixed to the bottom of the pressure cylinder 1 along the vertical direction. Its free end passes through the bottom of the plunger assembly 2 through the throttle hole 241 and is sleeved with a positioning block 12. The positioning block 12 is circumferentially provided with a plurality of first through holes for passing through hydraulic oil. The positioning block 12 can abut against the bottom of the plunger assembly 2 to limit the plunger assembly 2.

[0033] In the initial state, under the action of the elastic force of the spring and the limiting action of the positioning block 12, the bottom end of the plunger assembly 2 is inserted into the first open end of the pressure cylinder 1 and remains relatively stationary with the pressure cylinder 1; When the elevator falls and impacts the plunger assembly 2, the plunger assembly 2 moves downward and compresses the internal space of the pressure cylinder 1, so that the hydraulic oil sprays into the plunger assembly 2 through the annular gap between the throttle hole 241 and the regulating rod 11. The air in the plunger assembly 2 is discharged through the exhaust hole 221. When the hydraulic oil passes through the throttle hole 241, due to the sudden reduction of the flow area, eddy currents are formed, which can convert the impact kinetic energy of the elevator; At the same time, the larger-volume plunger assembly 2 can have a longer buffer stroke. The design of the expansion area 211 can reduce the height of the elevator buffer while ensuring the original performance and save the installation cost of the elevator.

[0034] By setting the upper part of the plunger assembly 2 as an enlarged volume area 211 with a diameter larger than that of the lower part, when the plunger assembly 2 has the same volume as the original structure, it can have a lower height than the original structure. The same volume enables the plunger assembly 2 to have sufficient space to absorb impact energy, while the lower height can effectively reduce the depth of the pit space, greatly reducing the manufacturing and installation costs of the elevator.

[0035] In a preferred embodiment, the plunger assembly 2 includes a plunger cylinder 21, and an enlarged volume area 211 and a straight cylinder area 212 are provided inside the plunger cylinder 21; buffer covers 22 and a lower end cover 23 are respectively covered at the upper and lower ends of the plunger cylinder 21. An exhaust hole 221 is provided in the middle of the buffer cover 22, an oil passage is provided on the lower end cover 23, a throttle ring 24 is provided in the oil passage, and the throttle hole 241 is provided on the throttle ring 24.

[0036] As Figure 3 shown, the plunger cylinder 21 is of a cylindrical structure, and a second open end and a third open end are respectively provided at its upper and lower ends. The buffer cover 22 is covered at the second open end, an exhaust hole 221 is provided in the middle of the buffer cover 22, a circular clamping groove is provided on the inner wall at the second open end, and a clamping portion is provided on the buffer cover 22. The clamping portion can be abutted in the clamping groove to fix the buffer cover 22 to the plunger cylinder 21. A soft buffer material is provided on the top of the buffer cover 22, which can offset the metal collision sound between the elevator and the elevator buffer. At the same time, the buffer cover 22 can prevent the hydraulic oil from spraying out from the top of the plunger cylinder 21 during impact. The lower end cover 23 is covered at the third open end, and an oil passage is provided thereon. The oil passage is used to make the hydraulic oil flow between the plunger cylinder 21 and the pressure cylinder 1. A throttle ring 24 is provided in the oil passage, and the adjusting rod 11 passes through the oil passage and the throttle hole 241.

[0037] In a preferred embodiment, a switch assembly 4 is further included. The switch assembly 4 is provided on one side of the plunger assembly 2 and is electrically connected to the elevator main engine. The switch assembly 4 has a first state and a second state. When in the first state, the positioning block 12 is separated from the bottom of the plunger assembly 2, and the elevator main engine is powered off; when in the second state, the positioning block 12 abuts against the bottom of the plunger assembly 2, and the elevator main engine is powered on.

[0038] As Figure 1 shown, the switch assembly 4 is controlled by the up and down movement of the plunger cylinder 21 in the pressure cylinder 1, thereby controlling the power on / off of the elevator main engine. When the plunger cylinder 21 moves downward under impact, the switch assembly 4 is triggered, and the elevator main engine is powered off, that is, the above-mentioned first state. When the plunger cylinder 21 is in the initial state or after reset, the switch assembly 4 is in an untriggered state or reset, and the elevator main engine is powered on, that is, the above-mentioned second state.

[0039] In a preferred embodiment, the switch assembly 4 includes a connecting plate 43 which is arranged on one side of the pressure cylinder 1. A trigger switch 41 is provided on the connecting plate 43 and is electrically connected to the elevator main machine. The switch assembly 4 further includes a trigger rod 42 which is fixed to the top of the plunger assembly 2. The free end of the trigger rod 42 extends in the vertical direction and can contact the trigger switch 41 when the plunger assembly 2 moves downward, so as to cut off the power supply of the elevator main machine.

[0040] As Figure 2 shown, the connecting plate 43 is fixed to one side of the top of the pressure cylinder 1. A trigger switch 41 is arranged horizontally on the connecting plate 43, and the trigger end of the trigger switch 41 is located on the side close to the pressure cylinder 1; the trigger rod 42 is fixed to one side of the plunger assembly 2 and corresponds to the position of the trigger end in the vertical direction. The trigger rod 42 is a rod-shaped structure with a rectangular cross-section and includes a first section, a second section and a third section which are integrally connected. The cross-sectional area of the first section is larger than that of the third section. The cross-sectional area of the second section gradually decreases from top to bottom, and the cross-sectional area of its top is the same as that of the first section, and the cross-sectional area of its bottom is the same as that of the third section. A guiding hole is formed in the connecting plate 43, and the third section penetrates through the connecting plate 43 through the guiding hole, and the guiding hole can guide the trigger rod 42; in the initial state, the third section is located on one side of the trigger end. When the plunger barrel 21 moves downward under impact, the trigger rod 42 is driven to move downward. When the second section moves downward, it contacts the trigger rod 42, and then the power supply of the elevator main machine is cut off through the trigger switch 41. When the plunger barrel 21 resets, the second section moves upward and disengages from the trigger end, and then the elevator main machine resumes power supply.

[0041] In a preferred embodiment, a sealing assembly 5 is further included. The sealing assembly 5 is arranged between the outer wall of the plunger assembly 2 and the inner wall of the pressure cylinder 1 to prevent hydraulic oil from leaking between the outer wall of the plunger assembly 2 and the inner wall of the pressure cylinder 1.

[0042] In a preferred embodiment, the sealing assembly 5 includes a first guide sleeve 51, a sealing ring 52 and a second guide sleeve 53. The first guide sleeve 51, the sealing ring 52 and the second guide sleeve 53 are sequentially fixed on the inner wall of the pressure cylinder 1 in the vertical direction and are in slidable contact with the outer wall of the plunger assembly 2.

[0043] As Figure 2As shown, the first guide sleeve 51, the sealing ring 52, and the second guide sleeve 53 are all annular structures, which are sequentially fixed on the inner wall of the pressure cylinder 1 in the vertical direction and sleeved on the outer periphery of the plunger barrel 21 to slide in contact with the outer wall of the plunger barrel 21. The first guide sleeve 51 and the second guide sleeve 53 are common guide rings in the prior art, having a certain hardness and support function, mainly used to separate the outer wall of the plunger barrel 21 from the inner wall of the pressure cylinder 1, avoiding wear and corrosion caused by long-term contact between metals, and thus affecting the performance of the buffer; the sealing ring 52 is mainly used for sealing to prevent hydraulic oil from leaking between the outer wall of the plunger barrel 21 and the inner wall of the pressure cylinder 1.

[0044] In a preferred embodiment, an annular convex portion 213 is provided on the outer wall of the top of the plunger barrel 21, and a spring seat 8 is provided on the outer wall of the top of the pressure cylinder 1. The upper and lower ends of the elastic member 3 respectively abut against the annular convex portion 213 and the spring seat 8.

[0045] As Figure 2 shown, the annular convex portion 213 can be integrally formed with the plunger barrel 21 by cold flipping or hot flipping methods during the processing of the plunger barrel 21. In this embodiment, the pressure cylinder has a guiding section and a convex section. The guiding section is the part of the inner wall of the pressure cylinder 1 where the sealing assembly 5 is provided. The diameter of the guiding section is smaller than that of the convex section, and can be formed by cold shrinking or hot shrinking processes. When the spring seat 8 is sleeved on the outer periphery of the guiding section, the convex section can limit the spring seat 8. In other embodiments of the present application, as Figure 5 and Figure 6 shown, the spring seat 8 integrally formed with the pressure cylinder 1 can also be directly obtained by cold shrinking or hot shrinking methods during the processing of the pressure cylinder 1. The method of using cold shrinking or hot shrinking for integral forming has better structural strength compared with the traditional welding method, effectively avoiding the situation that the solder joints are easily torn when subjected to strong impact in the traditional welding method.

[0046] In a preferred embodiment, the oil passage includes a tapered section 231, an intermediate section 232, and a throttling section 233 that are sequentially connected. A retaining ring 25 is fixed in the throttling section 233. The retaining ring 25 is sleeved on the outer periphery of the adjusting rod 11 and a throttling ring 24 is provided thereon.

[0047] As Figure 2 shown, the throttling section 233 is mainly used for installing the throttling ring 24. The retaining ring 25 is embedded in the inner wall of the throttling section 233 and fixed to the throttling section 233. The middle of the retaining ring 25 has a through hole. A throttling ring 24 is provided on the retaining ring 25. The adjusting rod 11 passes through the retaining ring 25 and the throttling ring 24 through the through hole and the throttling hole 241 in sequence. A plurality of second through holes are also provided circumferentially on the throttling ring 24. The diameter of the intermediate section 232 is slightly larger than that of the throttling hole 241. The upper end diameter of the tapered section 231 is larger than its lower end diameter, mainly used to facilitate the return flow of hydraulic oil when the plunger barrel 21 is reset.

[0048] In a preferred embodiment, an oil level rod 6 is further provided on the base 7, and the oil level rod 6 is used to measure the oil level height of the hydraulic oil inside the plunger assembly 2.

[0049] As Figure 4 shown, the oil level rod 6 is approximately a circular curved rod structure, and has a first sub-rod, a curved rod and a second sub-rod connected in sequence. The first sub-rod and the second sub-rod are parallel to each other but not coaxial. When measuring, the eccentrically arranged first sub-rod and second sub-rod can avoid the adjusting rod 11 and the positioning block 12 at the bottom of the plunger barrel 21 from interfering with the measurement result. The oil level rod 6 is detachably connected to the base 7 by bolts, and can be removed from the base 7 when needed to measure the oil level inside the plunger barrel 21.

[0050] Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. The above are only the preferred implementation manners of the present application. It should be noted that due to the limitation of literal expression, and objectively there are infinite specific structures. For those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements, retouches or changes can also be made, or the above technical features can be combined in an appropriate manner; these improvements, retouches, changes or combinations, or directly applying the concept and technical solution of the invention to other occasions without improvement, shall all be regarded as the protection scope of the present application.

Claims

1. An elevator buffer, characterized in that: include: Base (7); A pressure cylinder (1), the pressure cylinder (1) being arranged on the base (7) and used for containing hydraulic oil, and an adjusting rod (11) being fixedly connected to the bottom of the pressure cylinder (1); A plunger assembly (2), the plunger assembly (2) being movably inserted into the pressure cylinder (1), the top and bottom of the plunger assembly (2) being respectively provided with an exhaust hole (221) and a throttle hole (241), the free end of the adjusting rod (11) extending into the plunger assembly (2) through the throttle hole (241) in a vertical direction and being connected with a positioning block (12), the positioning block (12) being able to abut against the bottom of the plunger assembly (2) to limit the position of the plunger assembly (2); an elastic member (3) being sleeved on the outer periphery of the plunger assembly (2), the top end of the elastic member (3) being fixed to the top of the plunger assembly (2), and the bottom end thereof being fixed to the top of the pressure cylinder (1); the interior of the plunger assembly (2) being provided with an expansion area (211) and a straight tube area (212), the diameter of the expansion area (211) being larger than the diameter of the straight tube area (212).

2. An elevator buffer according to claim 1, characterized in that: The device further comprises a switch assembly (4), wherein the switch assembly (4) is arranged on one side of the plunger assembly (2) and is electrically connected to the elevator main unit. The switch assembly (4) has a first state and a second state. When in the first state, the positioning block (12) is separated from the bottom of the plunger assembly (2), and the elevator main unit is powered off; when in the second state, the positioning block (12) is against the bottom of the plunger assembly (2), and the elevator main unit is powered on.

3. An elevator buffer according to claim 2, characterized in that: The switch assembly (4) comprises a connecting plate (43), the connecting plate (43) being arranged on one side of the pressure cylinder (1), a trigger switch (41) being arranged on the connecting plate (43), the trigger switch (41) being electrically connected to the elevator main unit, the switch assembly (4) further comprising a trigger rod (42), the trigger rod (42) being fixed to the top of the plunger assembly (2), the free end of the trigger rod (42) extending in a vertical direction, and being able to contact the trigger switch (41) when the plunger assembly (2) moves downward, so as to cut off the power supply to the elevator main unit.

4. An elevator buffer according to claim 1, characterized in that: It also includes a sealing component (5), which is arranged between the outer wall of the plunger component (2) and the inner wall of the pressure cylinder (1) and is used to prevent the hydraulic oil from leaking between the outer wall of the plunger component (2) and the inner wall of the pressure cylinder (1).

5. An elevator buffer according to claim 4, characterized in that: The sealing assembly (5) comprises a first guide sleeve (51), a sealing ring (52) and a second guide sleeve (53); the first guide sleeve (51), the sealing ring (52) and the second guide sleeve (53) are fixed in sequence on the inner wall of the pressure cylinder (1) in a vertical direction and are in slidable contact with the outer wall of the plunger assembly (2).

6. An elevator buffer according to claim 1, characterized in that: The plunger assembly (2) comprises a plunger barrel (21), wherein the plunger barrel (21) has the expansion area (211) and the straight barrel area (212); the upper and lower ends of the plunger barrel (21) are respectively covered with a buffer cover (22) and a lower end cover (23), the middle of the buffer cover (22) is provided with the exhaust hole (221), the lower end cover (23) is provided with an oil passage, a throttling ring (24) is provided in the oil passage, and the throttling ring (24) has the throttling hole (241).

7. An elevator buffer according to claim 6, characterized in that: The top outer wall of the plunger tube (21) is provided with an annular protrusion (213), the top outer wall of the pressure cylinder (1) is provided with a spring seat (8), and the upper and lower ends of the elastic member (3) respectively abut against the annular protrusion (213) and the spring seat (8).

8. An elevator buffer according to claim 6, characterized in that: The oil passage comprises a tapered section (231), an intermediate section (232) and a throttling section (233) which are connected in sequence. A retaining ring (25) is fixed inside the throttling section (233). The retaining ring (25) is sleeved on the outer periphery of the regulating rod (11) and the throttling ring (24) is provided thereon.

9. An elevator buffer according to claim 1, characterized in that: The base (7) is also provided with an oil level rod (6), and the oil level rod (6) is used to measure the oil level height of the hydraulic oil inside the plunger assembly (2).

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