A multi-stage friction pair type buffer

Abstract

The present invention discloses a multi-stage friction pair type buffer. A multi-stage friction pair type buffer includes a base assembly fixed to the bottom pit of the hoistway. An active assembly is arranged above the base assembly. The active assembly is slidably connected to the base assembly. The active assembly is fixedly connected with a force application assembly. A plurality of multi-stage friction pair mechanisms are arranged on one side of the active assembly. The multi-stage friction pair mechanisms are fixed to the base assembly. The force application assembly applies frictional force to the active assembly through the multi-stage friction pair mechanisms. The present invention solves the problem that the braking deceleration of the existing elevator buffer is too large. By arranging a plurality of multi-stage friction pair mechanisms, the braking deceleration of the buffer is optimized, the personal safety of passengers is guaranteed, and the safety of the elevator is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator buffers, and in particular to a multi-stage friction pair buffer. Background Art

[0002] A buffer is a safety protection device installed at the terminal of an elevator operation, generally set in the bottom pit of an elevator shaft. When the elevator drops due to mechanical or electrical failures, the buffer will bear the impact of the weight of the elevator and passengers and stop the elevator.

[0003] Currently, there are mainly two types of elevator buffers in use. 1. Energy storage buffers, which are used for elevators with a rated speed not greater than 1.0 m / s, and the energy storage material is mostly polyurethane. 2. Energy-consuming buffers, which can be used for elevators with any rated speed, mainly oil pressure buffers. Through the stop test of the energy-consuming buffer, it can be known that when the elevator hits the buffer, the maximum stop deceleration can exceed 3.0gn, which will cause certain harm to passengers. Therefore, it is necessary to optimize the stop deceleration of the buffer.

[0004] "A reset trigger mechanism for an elevator buffer and an elevator buffer" disclosed in the Chinese patent literature, with the publication number CN213112105U, relates to a reset trigger mechanism for an elevator buffer. The elevator buffer includes an oil cylinder, a plunger, and a safety switch. The reset trigger mechanism includes a reset mechanism and a trigger member. The trigger member is used to trigger the safety switch. The reset mechanism includes a spring seat, an elastic member, and a compression spring cover. The spring seat is installed on the oil cylinder. The elastic member is sleeved outside the plunger and the oil cylinder and abuts against the spring seat. The compression spring cover is installed on the plunger and abuts against the elastic member. The trigger member is installed on the elastic member. Although the Chinese patent with the publication number CN213112105U relates to the field of elevator buffers, it cannot solve the problem of excessive stop deceleration. Summary of the Invention

[0005] The present invention solves the problem of excessive stop deceleration of the existing elevator buffer, and provides a multi-stage friction pair buffer. By setting a multi-stage friction pair mechanism, the stop deceleration of the buffer is optimized to ensure the personal safety of passengers.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A multi-stage friction pair buffer includes a base assembly fixed to the bottom pit of the shaft. An active assembly is arranged above the base assembly. The active assembly is slidably connected to the base assembly. The active assembly is fixedly connected with a force application assembly. A plurality of multi-stage friction pair mechanisms are arranged on one side of the active assembly. The multi-stage friction pair mechanisms are fixed to the base assembly. The force application assembly applies frictional force to the active assembly through the multi-stage friction pair mechanisms.

[0007] In the present invention, the base assembly is fixed to the bottom pit of the hoistway by expansion bolts, and the force application assembly is fixed to the movable assembly through a lock nut. When the elevator falls, it impacts the movable assembly, enabling the movable assembly to move downward, and at the same time driving the force application assembly to move downward. The force application assembly drives the multi-stage friction pair mechanism. After being driven, the multi-stage friction pair mechanism applies a frictional force to the movable assembly, and by increasing the frictional force, a better braking effect on the elevator is achieved until the elevator stops falling.

[0008] Preferably, the multi-stage friction pair mechanism includes a sleeve. One side of the sleeve is connected with a push rod and a reset rod, and the other side of the sleeve is connected with a push bar. The other side of the push bar is connected with an adjusting sleeve, and the other side of the adjusting sleeve is connected with a friction push rod. The other side of the friction push rod is fixed with a friction plate.

[0009] In the present invention, within the multi-stage friction pair mechanism, the provided push rod can be laterally pushed under the action of the force application assembly; the reset rod can be reset in combination with a reset bolt; the push bar is threadedly connected with the adjusting sleeve. Similarly, the other side of the adjusting sleeve and the friction push rod are threadedly connected, and the friction push rod and the friction plate are fixedly connected to each other. The friction plate can contact the movable assembly and apply a frictional force.

[0010] Preferably, a top plate connected to the push rod and the reset rod is arranged inside the sleeve. The other side of the top plate is connected with a spring, and the other side of the spring is connected with a push plate. The push plate is connected to the push bar; a friction pair bracket is arranged outside the sleeve, and the sleeve is fixed to the base assembly through the friction pair bracket.

[0011] In the present invention, the sleeve is a cylindrical cavity. Two square holes are opened on the sealing plate of the end face of the sleeve close to the push rod, and the push rod and the reset rod respectively pass through the two square holes. The other end of the sleeve is fixed with a friction pair bracket, and a square hole is opened on the friction pair bracket, and the push bar passes through the square hole.

[0012] Preferably, the base assembly includes a bottom plate fixed to the bottom pit of the hoistway. Above the bottom plate, a column and a fixing seat for fixing the multi-stage friction pair mechanism are respectively fixedly connected. A guiding plate is arranged on the outer edge of the column. The guiding plate includes a first guiding plate and a second guiding plate spaced from the first guiding plate, and a notch is arranged on the outer edge of the guiding plate.

[0013] In the present invention, the bottom plate of the base assembly can be fixed to the bottom pit of the hoistway, specifically fixed by expansion bolts, which plays a role in supporting the entire buffer; the fixing seat is fixed to the multi-stage friction pair mechanism and part of the force application assembly, playing a fixing role, and at the same time, it can play a role in protecting the outer shell; a second guiding plate is arranged at the outermost edge position above the column, and the second guiding plate is arranged at a certain distance downward along the axial direction of the column. A notch is arranged on the outer edge part of the guiding plate for cooperating with the movable assembly for movable connection.

[0014] Preferably, the movable component includes a movable column, and several guide rods penetrating through the guide plate are fixedly connected inside the movable column. A connecting plate is fixed above the movable column, a buffer pad is arranged above the connecting plate, and the other side of the connecting plate is connected to the force - applying component.

[0015] In the present invention, the movable column of the movable component is a cylindrical cavity, and multiple guide rods are welded inside it. The guide rods can penetrate through the notches of the guide plate to ensure that the movable component can move up and down. The connecting plate is arranged above the movable column, and the force - applying component is connected to the movable component through the connecting plate, ensuring that when the movable component moves downward, the force - applying component is driven to move downward accordingly.

[0016] Preferably, the force - applying component includes an inclined - plane rod. One end of the inclined - plane rod is provided with a positioning nut and a locking nut, and the inclined - plane rod is fixed to the movable component through the positioning nut and the locking nut. The other end of the inclined - plane rod is provided with a guide bracket, the guide bracket is fixed to the fixed seat, and the guide bracket is provided with a hole for the inclined - plane rod to pass through.

[0017] In the present invention, external threads are provided above the inclined - plane rod of the force - applying component. A positioning nut is arranged above the connecting plate, and a locking nut is arranged below the connecting plate. The positioning nut and the locking nut can ensure the up - and - down position and fixation of the inclined - plane rod. When the inclined - plane rod is in the initial position, a guide bracket is arranged at the other end of the inclined - plane rod. The inclined - plane rod can only move up and down through the guide bracket, playing a role in limiting, so as to ensure that the inclined - plane rod triggers the multi - stage friction pair mechanism after moving.

[0018] Preferably, a first reset bolt is arranged at the end of the reset rod far from the sleeve. The first reset bolt penetrates through the side wall of the fixed seat, and a reset switch is arranged on one side of the fixed seat near the position of the first reset bolt.

[0019] In the present invention, a threaded hole is opened on the side wall of the fixed seat. During reset, the first reset bolt can be screwed in to make the reset rod move horizontally, and the reset switch is disconnected to cut off the elevator power supply.

[0020] Preferably, a reset plate is fixedly connected to the outside of the push rod. A lock - nut is further arranged on the side of the reset plate far from the push rod, and a second reset bolt is arranged on one side of the reset plate. The second reset bolt penetrates through the side wall of the fixed seat.

[0021] In the present invention, the reset plate penetrates through the push rod and is fixed by the lock - nut, and by screwing in the second reset bolt, the second reset bolt contacts the reset plate and drives it to move horizontally in the direction of the force - applying component. A threaded hole is also opened on the side wall of the fixed seat here to ensure the screwing in of the second reset bolt.

[0022] Preferably, a safety switch is fixedly connected below the guiding bracket.

[0023] In the present invention, since the safety switch is arranged below the guiding bracket, when the inclined rod moves downward, the end of the inclined rod penetrates through the guiding bracket, and then passes through the safety switch to disconnect the safety switch, thereby cutting off the elevator power supply.

[0024] Preferably, a limit bolt is fixedly connected to the lower end of the guiding rod.

[0025] In the present invention, the limit bolt is used to move the movable assembly upward to a certain height during the reset process, prevent the movable assembly from detaching from the base assembly, and play a role in limiting at the same time.

[0026] The beneficial effect of the present invention is that a multi-stage friction pair type buffer of the present invention optimizes the braking deceleration of the buffer by arranging a plurality of multi-stage friction pair mechanisms, ensures the personal safety of passengers, and improves the safety of the elevator. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of a multi-stage friction pair type buffer of the present invention from one perspective;

[0028] Figure 2 is a structural diagram of a multi-stage friction pair type buffer of the present invention from another perspective;

[0029] Figure 3 is a cross-sectional view of a multi-stage friction pair type buffer of the present invention;

[0030] Figure 4 is a schematic structural diagram of a multi-stage friction pair type buffer of the present invention with the fixed seat removed;

[0031] Figure 5 is a schematic structural diagram of a multi-stage friction pair mechanism of a multi-stage friction pair type buffer of the present invention from one perspective;

[0032] Figure 6 is a schematic structural diagram of a multi-stage friction pair mechanism of a multi-stage friction pair type buffer of the present invention from another perspective;

[0033] Among them, 1.1, vertical column; 1.2, guide plate; 1.21, first guide plate; 1.22, second guide plate; 1.3, fixed seat; 1.4, bottom plate; 2.1, movable column; 2.2, guide rod; 2.3, buffer pad; 2.4, connecting plate; 3.1, sleeve; 3.2, friction pair support; 3.3, spring; 3.4, ejector rod; 3.5, reset rod; 3.6, top plate; 3.7, push plate; 3.8, push rod; 3.9, reset plate; 3.10, adjusting sleeve; 3.11, friction push rod; 3.12, friction plate; 4.1, inclined plane rod; 4.2, positioning nut; 4.3, locking nut; 4.4, guide support; 5.1, first reset bolt; 5.1.1, second reset bolt; 5.2, safety switch; 5.3, reset switch; 5.4, limit bolt. Detailed implementation mode

[0034] Embodiment 1:

[0035] This embodiment provides a multi-stage friction pair type buffer. Refer to Figure 1 and Figure 2 , which includes a base assembly fixed to the bottom pit of the hoistway. An active assembly is arranged above the base assembly. The active assembly is slidably connected to the base assembly. The active assembly is fixedly connected with a force application assembly. A plurality of multi-stage friction pair mechanisms are arranged on one side of the active assembly. The multi-stage friction pair mechanisms are fixed to the base assembly. The force application assembly applies frictional force to the active assembly through the multi-stage friction pair mechanisms. Specifically, the multi-stage friction pair mechanisms are moved horizontally through the force application assembly, thereby increasing the frictional force on the active assembly to achieve a good braking effect.

[0036] Refer to Figure 3 , Figure 5 and Figure 6, the multi-stage friction pair mechanism includes a sleeve 3.1. One side of the sleeve 3.1 is connected with a push rod 3.4 and a reset rod 3.5, and the other side of the sleeve is connected with a push rod 3.8. The other side of the push rod 3.8 is connected with an adjusting sleeve 3.10, and the other side of the adjusting sleeve 3.10 is connected with a friction push rod 3.11. A friction plate 3.12 is fixed on the other side of the friction push rod 3.11. In this embodiment, two multi-stage friction pair mechanisms are provided, which are arranged along the height direction to achieve the effect of multi-stage braking. Specifically, the cross-sections of the push rod 3.4 and the reset rod 3.5 are both square, and one end is an arc surface and the other end is a flat surface. The arc surface of the push rod 3.4 can contact the inclined surface rod 4.1, and the arc surface of the reset rod 3.5 contacts the first reset bolt 5.1. The flat surfaces of the push rod 3.4 and the reset rod 3.5 are both connected to the top plate 3.6 inside the sleeve 3.1. One end of the push rod 3.8 has a square cross-section and is connected to the push plate 3.7, and the other end of the push rod 3.8 has a circular cross-section. There is also a thread on the outer circumference of this end face, and the threaded part is connected to the reset plate 3.9. The square cross-section end of the push rod 3.8 penetrates through the friction pair bracket 3.2, and the threaded part of the push rod 3.8 is also connected to the adjusting sleeve 3.10. The other end of the adjusting sleeve 3.10 is connected to the friction push rod 3.11 through a thread. Rotating the adjusting sleeve 3.10 can change the compression length of the spring 3.3, thereby adjusting the friction force value.

[0037] Reference Figure 3 , Figure 5 and Figure 6 , a top plate 3.6 connected to the push rod 3.4 and the reset rod 3.5 is arranged inside the sleeve 3.1. The other side of the top plate 3.6 is connected with a spring 3.3, and the other side of the spring 3.3 is connected with a push plate 3.7. The push plate 3.7 is connected to the push rod 3.8. A friction pair bracket 3.2 is arranged outside the sleeve 3.1, and the sleeve 3.1 is fixed to the base assembly through the friction pair bracket 3.2. In this embodiment, the sleeve 3.1 is a cylindrical cavity. When the push rod 3.4 moves under a lateral thrust, the spring 3.3 is compressed, and the spring 3.3 applies a thrust to the push plate 3.7 and the push rod 3.8, finally causing the friction plate 3.12 to generate a frictional force.

[0038] Reference Figure 1 , Figure 2 and Figure 4 , the base assembly includes a bottom plate 1.4 fixed to the bottom pit of the hoistway. Above the bottom plate 1.4, a column 1.1 and a fixed seat 1.3 for fixing the multi-stage friction pair mechanism are respectively and fixedly connected. A guide plate 1.2 is arranged on the outer edge of the column 1.1. The guide plate 1.2 includes a first guide plate 1.21 and a second guide plate 1.22 arranged at an interval from the first guide plate 1.21. There is a notch on the outer edge of the guide plate 1.2. In this embodiment, the column 1.1 is cylindrical, and a second guide plate 1.22 is arranged at the top of the outer edge of the column 1.1. The first guide plate 1.21 and the second guide plate 1.22 are separated by a certain distance.

[0039] Reference Figure 1 、 Figure 2 and Figure 3 As shown in FIGS.

[0040] Reference Figure 1 、 Figure 2 and Figure 3 The force - applying component includes an inclined - plane rod 4.1. One end of the inclined - plane rod 4.1 is provided with a positioning nut 4.2 and a locking nut 4.3, and the inclined - plane rod 4.1 is fixed to the movable component through the positioning nut 4.2 and the locking nut 4.3; the other end of the inclined - plane rod 4.1 is provided with a guiding bracket 4.4, the guiding bracket 4.4 is fixed to the fixed seat 1.3, and the guiding bracket 4.4 is provided with a hole for the inclined - plane rod 4.1 to pass through. In this embodiment, the inclined - plane rod 4.1 is arranged along the height direction and moves along the height direction.

[0041] Reference Figure 1 、 Figure 4 and Figure 5 One end of the reset rod 3.5 far from the sleeve 3.1 is provided with a first reset bolt 5.1. The first reset bolt 5.1 penetrates through the side wall of the fixed seat 1.3, and a reset switch 5.3 is arranged on one side of the fixed seat 1.3 near the position of the first reset bolt 5.1. In this embodiment, a threaded hole is opened on the side wall of the fixed seat 1.3. When resetting, the first reset bolt 5.1 can be screwed in to make the reset rod 3.5 move horizontally, and the reset switch 5.3 is turned off to cut off the elevator power supply.

[0042] Reference Figure 2 and Figure 4 A reset plate 3.9 is fixedly connected to the outside of the push rod 3.8. A lock - nut is also arranged on the side of the reset plate 3.9 far from the push rod 3.8. A second reset bolt 5.1.1 is arranged on one side of the reset plate 3.9. The second reset bolt 5.1.1 penetrates through the side wall of the fixed seat 1.3. In this embodiment, the reset plate 3.9 penetrates through the push rod 3.8 and is fixed by the lock - nut. By screwing in the second reset bolt 5.1.1, the second reset bolt 5.1.1 contacts the reset plate 3.9 and drives it to move horizontally towards the force - applying component; a threaded hole is also opened on the side wall of the fixed seat 1.3 here to ensure the screwing in of the second reset bolt 5.1.1.

[0043] ReferenceFigure 1 , Figure 2 and Figure 3 , a safety switch 5.2 is fixedly connected below the guiding bracket 4.4. A limiting bolt 5.4 is fixedly connected to the lower end of the guiding rod 2.2. In this embodiment, since the safety switch 5.2 is arranged below the guiding bracket 4.4, when the inclined plane rod 4.1 moves downward, the end of the inclined plane rod 4.1 penetrates through the guiding bracket 4.4, so as to pass through the safety switch 5.2 to disconnect the safety switch 5.2, thereby cutting off the elevator power supply. The limiting bolt 5.4 is used to move the movable assembly upward to a certain height during the reset process, prevent the movable assembly from separating from the base assembly, and play a role in limiting at the same time.

[0044] For the specific implementation process of the present invention, it is described in detail here. When the elevator falls and impacts the buffer pad 2.3, the movable column 2.1 is pressed and moves downward, the connecting plate 2.4 drives the force applying assembly to move downward, the inclined plane rod 4.1 moves downward to disconnect the safety switch 5.2, and the elevator power supply is cut off. At this time, the friction plate 3.12 acts on the movable column 2.1 to start braking the elevator; when the elevator continues to fall, the inclined plane rod 4.1 moves downward and acts on the ejector rod 3.4 (the ejector rod 3.4 of the multi-stage friction pair mechanism located above), the ejector rod 3.4 is horizontally pushed by the inclined plane rod 4.1, through the force transmission inside the multi-stage friction pair mechanism, the friction force is increased through the friction plate 3.12, and the movable column 2.1 is braked; when the elevator continues to fall, the inclined plane rod 4.1 moves downward and acts on the ejector rod 3.4 (the ejector rod 3.4 of the multi-stage friction pair mechanism located below), this ejector rod 3.4 is horizontally pushed by the inclined plane rod 4.1, further increasing the friction force, and a better braking effect is achieved on the movable column 2.1 until the elevator stops falling; through multi-stage friction braking, the safety of the elevator is ensured.

[0045] In the reset process of the present invention, after the elevator moves upward and leaves the buffer, the second reset bolt 5.1.1 is screwed into the fixed seat 1.3, referring to Figure 3 the position A in Figure 2 , or the position where the second reset bolt 5.1.1 is located in Figure 3 can also be referred to. After screwing in, the reset plate 3.9 is pushed towards the force applying assembly until the friction plate 3.12 is separated from the movable column 2.1. The locking nut 4.3 is unscrewed, the movable column 2.1 is lifted until the limiting bolt 5.4 abuts against the first guiding plate 1.21, the second reset bolt 5.1.1 is unscrewed, the friction plate 3.12 is attached to the movable column 2.1, and under the action of the spring 3.3, the movable column 2.1 returns to the initial working position, and the initial relative position seal between the friction plate 3.12 and the movable column 2.1 is checked; subsequently, the first reset bolt 5.1 is screwed into the fixed seat 1.3, referring to Figure 3 the position B in Figure 1After the first reset bolt 5.1 is screwed in, the reset switch 5.3 is disconnected, the elevator power supply is cut off, and the reset rod 3.5 is pushed toward the movable column 2.1 until the inclined rod 4.1 can be lifted up to the position where the positioning nut 4.2 rests against the connecting plate 2.4. Then tighten the locking nut 4.3; unscrew the first reset bolt 5.1, check all seals, close the reset switch 5.3 and the safety switch 5.2, and the buffer returns to the working state.

[0046] In this embodiment, the base assembly and the shaft pit are fixed with expansion bolts, and the force-applying assembly is fixed to the movable assembly by a locking nut. When the elevator falls, it hits the movable assembly, causing the movable assembly to move downward, while also driving the force-applying assembly downward. The force-applying assembly drives the multi-stage friction pair mechanism, and after being driven, the multi-stage friction pair mechanism applies friction force to the movable assembly, thereby achieving a better stopping effect on the elevator by increasing the friction force until the elevator stops falling.

[0047] In this embodiment, in the multi-stage friction pair mechanism, the push rod is capable of being pushed laterally under the action of the force-applying component; the reset rod can be reset in conjunction with the reset bolt; the push rod is threadedly connected to the adjusting sleeve, and similarly, the other side of the adjusting sleeve is threadedly connected to the friction push rod. The friction push rod and the friction plate are fixedly connected, and the friction plate can contact the movable component and apply friction.

[0048] In this embodiment, the sleeve is a cylindrical cavity, and two square holes are provided on the sealing plate on one end face of the sleeve close to the push rod, through which the push rod and the reset rod are passed respectively. A friction pair bracket is fixed to the other end of the sleeve, and a square hole is provided on the friction pair bracket, through which a push rod is passed.

[0049] In this embodiment, the bottom plate of the base assembly can be fixed to the bottom pit of the shaft, specifically by expansion bolts, to support the entire buffer; the fixed seat is fixed to the multi-stage friction pair mechanism and part of the force-applying assembly, to play a fixing role, and at the same time, can play a role in protecting the outer shell; a second guide plate is provided at the uppermost outer edge of the column, and a second guide plate is provided at a certain distance downward along the axial direction of the column, and a notch is provided on the outer edge of the guide plate for cooperating with the movable assembly for movable connection.

[0050] In this embodiment, the movable column of the movable component is a cylindrical cavity with multiple guide rods welded inside. The guide rods can pass through the gaps in the guide plate to ensure that the movable component can move up and down; the connecting plate is arranged above the movable column, and the force-applying component is connected to the movable component through the connecting plate to ensure that when the movable component moves downward, it will drive the force-applying component to move downward as well.

[0051] In this embodiment, an external thread is provided above the inclined plane rod of the force application component, a positioning nut is provided above the connecting plate, and a locking nut is provided below the connecting plate. The positioning nut and the locking nut can ensure the up and down position of the inclined plane rod and fix it; when the inclined plane rod is in the initial position, a guiding bracket is provided at the other end of the inclined plane rod. Through the guiding bracket, the inclined plane rod can only move up and down, playing a role in limiting to ensure that the inclined plane rod triggers the multi-stage friction pair mechanism after moving.

[0052] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A multi-stage friction pair type buffer, characterized in that, It includes a base assembly fixed to the bottom pit of the hoistway. An active assembly is arranged above the base assembly. The active assembly is slidably connected to the base assembly. The active assembly is fixedly connected with a force-applying assembly. A number of multi-stage friction pair mechanisms are arranged on one side of the active assembly. The multi-stage friction pair mechanisms are fixed to the base assembly. The force-applying assembly applies frictional force to the active assembly through the multi-stage friction pair mechanisms. The multi-stage friction pair mechanism includes a sleeve (3.1). One side of the sleeve (3.1) is connected with a push rod (3.4) and a reset rod (3.5). The other side of the sleeve is connected with a push rod (3.8). The other side of the push rod (3.8) is connected with an adjusting sleeve (3.10). The other side of the adjusting sleeve (3.10) is connected with a friction push rod (3.11). A friction plate (3.12) is fixed to the other side of the friction push rod (3.11).

2. The multi-stage friction pair type buffer according to claim 1, characterized in that, A top plate (3.6) connected to the push rod (3.4) and the reset rod (3.5) is arranged inside the sleeve (3.1). A spring (3.3) is connected to the other side of the top plate (3.6). A push plate (3.7) is connected to the other side of the spring (3.3). The push plate (3.7) is connected to the push rod (3.8). A friction pair support (3.2) is arranged outside the sleeve (3.1). The sleeve (3.1) is fixed to the base assembly through the friction pair support (3.2).

3. The multi-stage friction pair type buffer according to claim 1, characterized in that, The base assembly includes a bottom plate (1.4) fixed to the bottom pit of the hoistway. A column (1.1) and a fixing seat (1.3) for fixing the multi-stage friction pair mechanism are respectively and fixedly connected above the bottom plate (1.4). A guide plate (1.2) is arranged on the outer edge of the column (1.1). The guide plate (1.2) includes a first guide plate (1.21) and a second guide plate (1.22) arranged at an interval from the first guide plate (1.21). A notch is arranged on the outer edge of the guide plate (1.2).

4. The multi-stage friction pair type buffer according to claim 3, characterized in that, The active assembly includes an active column (2.1). A number of guide rods (2.2) penetrating through the guide plate (1.2) are fixedly connected inside the active column (2.1). A connecting plate (2.4) is fixed above the active column (2.1). A buffer pad (2.3) is arranged above the connecting plate (2.4). The other side of the connecting plate (2.4) is connected to the force-applying assembly.

5. The multi-stage friction pair type buffer according to claim 4, characterized in that, The force-applying assembly includes an inclined plane rod (4.1). A positioning nut (4.2) and a locking nut (4.3) are arranged at one end of the inclined plane rod (4.1). The inclined plane rod (4.1) is fixed to the active assembly through the positioning nut (4.2) and the locking nut (4.3). A guide support (4.4) is arranged at the other end of the inclined plane rod (4.1). The guide support (4.4) is fixed to the fixing seat (1.3). The guide support (4.4) is provided with a hole for the inclined plane rod (4.1) to pass through.

6. A multi-stage friction pair type buffer according to claim 1 or 2, characterized in that, A first reset bolt (5.1) is arranged at one end of the reset rod (3.5) far from the sleeve (3.1). The first reset bolt (5.1) penetrates through the side wall of the fixing seat (1.3). A reset switch (5.3) is arranged on one side of the fixing seat (1.3) near the position of the first reset bolt (5.1).

7. A multi-stage friction pair type buffer according to claim 1 or 2, characterized in that, A reset plate (3.9) is fixedly connected to the outer side of the push rod (3.8). A locknut is further provided on the side of the reset plate (3.9) away from the push rod (3.8). A second reset bolt (5.1.1) is provided on one side of the reset plate (3.9), and the second reset bolt (5.1.1) penetrates through the side wall of the fixed seat (1.3).

8. A multi-stage friction pair type buffer according to claim 5, characterized in that A safety switch (5.2) is fixedly connected below the guide bracket (4.4).

9. The multi-stage friction pair type buffer according to claim 4, characterized in that, A limit bolt (5.4) is fixedly connected to the lower end of the guide rod (2.2).

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