Elevator fall arrest device

Abstract

The application relates to an elevator falling buffer device, which comprises a car, a first buffer device, a second buffer device and an elevator track; the first buffer device is arranged below the car and is used for providing buffer when the car falls to the ground; the second buffer device is arranged between the side of the first buffer device and the elevator track and is used for providing buffer during falling when the car falls along the elevator track. The falling speed of the car is reduced through the buffer of the second buffer device during the falling of the elevator, and the buffer when the car falls to the ground is realized through the arrangement of the first buffer device arranged below the car, so that multiple protection of the elevator and the passengers is realized.

Description

Technical Field

[0001] This invention relates to the field of elevator equipment technology, and specifically to an elevator descent buffer device. Background Technology

[0002] A vertical elevator is a transportation device that vertically transports people or goods.

[0003] A vertical elevator operates on designated floors of a building. A vertical elevator has a car that runs between at least two vertical or inclined rigid guide rails with an angle of less than 15°.

[0004] During elevator operation, there is a possibility of the elevator car suddenly plummeting, which often results in damage to the elevator and injury to passengers. Therefore, most vertical elevators are equipped with emergency braking devices to maintain stability in emergencies. However, even with braking devices, they can fail in certain unexpected situations. Therefore, an elevator descent buffer device is needed to protect the elevator and its passengers. Summary of the Invention

[0005] The purpose of this invention is to solve the problem of elevator car falling caused by the failure of the emergency braking device in the prior art, and to provide an elevator falling buffer device to provide a falling buffer and protect the elevator and passengers.

[0006] To achieve the above objectives, the present invention provides an elevator descent buffer device, which includes a car, a first buffer device, a second buffer device, and an elevator track; the first buffer device is disposed below the car and is used to provide buffering when the car falls and lands; the second buffer device is disposed on the side of the first buffer device and between the elevator track, and is used to provide buffering during the descent of the car along the elevator track.

[0007] The second buffer device reduces the descent speed of the elevator car during its descent, while the first buffer device located under the car provides cushioning during descent and upon landing, thus providing multiple layers of protection for the elevator and its passengers.

[0008] Preferably, the first buffer device includes a mounting box disposed below the car, which is used to provide cushioning for the car to land.

[0009] By installing a mounting box under the car, a buffer is achieved when the car lands, effectively preventing the car from directly contacting the ground below.

[0010] Preferably, the mounting box includes an upper mounting box disposed below the car and a lower mounting box disposed below the upper mounting box.

[0011] The use of upper and lower mounting boxes provides double buffering for the car to land.

[0012] Preferably, the first buffer device further includes a second water tank and a hollow rod; the lower end of the hollow rod is fixedly installed on the second water tank and communicates with the inside of the second water tank, the upper end of the hollow rod passes through the lower mounting box, and the hollow rod is slidably connected to the lower mounting box.

[0013] The second water tank provides a flexible buffer before the car lands, and the hollow rods allow for the depressurization of the water flow in the second water tank.

[0014] Preferably, the first buffer device further includes a first pressure plate, a connecting rod, a second pressure plate, a rubber block, and a sealing piston plate; the first pressure plate is fitted against the inner side of the upper mounting box and slidably installed inside the upper mounting box, the bottom end of the first pressure plate is fixedly connected to the connecting rod, the second pressure plate is disposed below the first pressure plate and fixedly installed on the inner wall of the upper mounting box, the upper end of the second pressure plate is fixedly installed with a rubber block; the sealing piston plate is installed in the lower mounting box; the connecting rod passes through the rubber block and the second pressure plate, the connecting rod can slide relative to the rubber block and the second pressure plate, and the lower end of the connecting rod is fixedly connected to the sealing piston plate.

[0015] The sealing piston plate is limited and guided by the first pressure plate, the second pressure plate and the connecting rod. The sealing piston plate further cushions the car when it lands.

[0016] Preferably, the first buffer device further includes a first water tank and a third pressure plate; the first water tank is disposed below the sealing piston plate and is sealed and fitted inside the lower mounting box; the third pressure plate is fixedly installed at the bottom of the first water tank, and the third pressure plate is provided with multiple connecting grooves, which communicate with the first water tank; the upper end of the hollow rod is fixedly connected to the third pressure plate and communicates with the connecting grooves; a return spring is also fitted on the hollow rod, the top end of the return spring is fixedly connected to the third pressure plate, and the bottom end of the return spring is fixedly connected to the bottom surface inside the lower mounting box.

[0017] The installation of the first water tank and hollow rods further facilitates the landing buffer of the car, while also enabling water circulation in the first and second water tanks.

[0018] Preferably, the first buffer device further includes a braking device, which is located on the side of the lower mounting box and is used to brake the descending car.

[0019] The braking device was used to cushion the descent of the car.

[0020] Preferably, the braking device includes a brake box, a connecting oil pipe, a piston push plate, a limiting block, a limiting groove, and a connecting spring; the brake box is installed on the side of the lower mounting box, the piston push plate is slidably installed inside the brake box, the limiting block is installed on the side of the piston push plate away from the lower mounting box, and the limiting groove is provided on the brake box for the passage and guidance of the limiting block; the first end of the connecting spring is fixedly installed on the side of the piston push plate away from the lower mounting box, and the second end of the piston push plate is fixedly installed on the brake box wall for resetting the piston push plate; the connecting oil pipe is installed on the side wall of the lower mounting box, the first end of the connecting oil pipe is connected to the cavity between the first water tank and the sealing piston plate, and the second end of the connecting oil pipe is connected to the inside of the brake box.

[0021] The limit block is driven by connecting the oil pipe and the piston push plate, and the limit block is used to decelerate and buffer the car during its descent.

[0022] Preferably, the braking device further includes a mounting plate and rollers. The mounting plate is installed on the side of the brake box away from the lower mounting box. The mounting plate is provided with a mounting groove, a rotating shaft is installed in the mounting groove, and rollers are installed on the rotating shaft.

[0023] Preferably, the upper mounting box is a box with an opening at the bottom, and the lower mounting box is a box with an opening at the top. The upper mounting box and the lower mounting box are connected by bolts.

[0024] The first buffer device can be easily assembled by setting an opening at the bottom of the upper mounting box and an opening at the top of the lower mounting box.

[0025] Preferably, the second buffer device includes a U-shaped connector, a telescopic rod, a push plate, a brake block, and a first friction plate; the U-shaped connector is installed on the first buffer device and inserted into the elevator track, and the U-shaped connector is slidably connected to the elevator track; the telescopic rod is fixedly installed on the inner wall of the bottom side of the U-shaped connector, a push plate is fixedly installed at the output end of the telescopic rod, a brake block is fixedly installed on the push plate, and a first friction plate is installed on the surface of the brake block near the elevator track.

[0026] The deceleration and buffering during the car's descent are achieved by using a U-shaped connector and a first friction plate.

[0027] Preferably, the brake block is T-shaped, and a brake ring is fitted on the protruding end of the brake block. A second friction plate is provided on the surface of the brake ring near the elevator track, and a first friction plate is provided on the surface of the protruding end of the brake block near the elevator track.

[0028] The braking rings were used to further decelerate the car during its descent.

[0029] Preferably, the brake block has a cavity, and a piston ring is slidably connected inside the cavity. A sliding tube is fixedly connected to the first side of the piston ring, and the second end of the sliding tube passes through the brake block and through a U-shaped connector to connect to the water supply. A through hole is provided on the side wall of the brake block, and the through hole communicates with the cavity.

[0030] The piston rings were cooled by using a sliding tube and a through hole.

[0031] Preferably, the elevator track is provided with a through groove, and a compression spring is provided in the through groove, with a sliding plate connected to the outer end of the compression spring.

[0032] The compression spring and sliding plate ensure stable contact between the first friction plate and the elevator track. At the same time, when the first friction plate contacts the sliding plate and is limited, the second friction plate on the brake ring contacts the elevator track, thus achieving double deceleration and buffering.

[0033] Preferably, the first buffer device further includes a buffer pad, which is disposed under the car, and the upper mounting box is installed at the bottom of the buffer pad.

[0034] The addition of a buffer pad provides further cushioning when the car lands.

[0035] The technical solution provided by this invention reduces the descent speed of the elevator car by using a second buffer device during the elevator's descent process, buffers the car when it lands by using a first buffer device located below the car, decelerates the elevator's descent by using a brake box, and slows down the descent by using a first friction plate and a second friction plate. This provides multiple protections for the elevator and its passengers. Attached Figure Description

[0036] To better understand the above and other objects, features, advantages, and functions of the present invention, reference can be made to the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of the invention and are not intended to limit the scope of the invention; the components in the drawings are not drawn to scale.

[0037] Figure 1 This is a schematic diagram of an elevator falling buffer device according to one embodiment of the present invention;

[0038] Figure 2 for Figure 1 Sectional view at point AA;

[0039] Figure 3 for Figure 2 Sectional view at BB;

[0040] Figure 4 for Figure 2 Enlarged view at point C;

[0041] Figure 5 This is an enlarged view of the brake box structure in one embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] Elevator shaft 1; Elevator track 2; Car 3; Buffer pad 4; Upper mounting box 5; Lower mounting box 6; Hollow rod 7; Second water tank 8; Brake box 9; Mounting plate 10; Roller 11; U-shaped connector 12; Through groove 13; Compression spring 14; Sliding plate 15; Telescopic rod 16; Push plate 17; Guide block 18; Guide groove 19; Sliding tube 20; Brake block 21; Brake ring 22; First friction plate 23; Cavity 24; Piston ring 25; Through hole 26; First pressure plate 27; Rubber block 28; Second pressure plate 29; Connecting rod 30; Sealing piston plate 31; First water tank 32; Return spring 33; Connecting groove 34; Limiting plate 35; Connecting oil pipe 36; Piston push plate 37; Limiting block 38; Limiting groove 39; Connecting spring 40; Third pressure plate 41; Second friction plate 42. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Preferred embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following preferred embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely preferred embodiments of apparatus and methods consistent with some aspects of the invention as detailed in the appended claims. Other ways in which the invention can be implemented based on the preferred embodiments will be conceived by those skilled in the art, and such other ways also fall within the scope of the invention. In the following detailed description, directional terms such as “upper,” “lower,” “inner,” “outer,” “longitudinal,” and “transverse” are used with reference to the directions described in the accompanying drawings. Components of embodiments of the present invention may be placed in different orientations; directional terms are for illustrative purposes and not restrictive.

[0045] The purpose of this invention is to solve the problem of elevator car 3 falling due to failure of the emergency braking device in the prior art, and to provide an elevator falling buffer device to provide falling buffer and protect the elevator and passengers.

[0046] like Figures 1-5As shown, the present invention provides an elevator falling buffer device, which includes a car 3, a first buffer device, a second buffer device, and an elevator track 2; the first buffer device is disposed below the car 3 and is used to provide buffering when the car 3 falls and lands; the second buffer device is disposed on the side of the first buffer device and between the elevator track 2 and is used to provide buffering during the falling process of the car 3 along the elevator track 2.

[0047] The second buffer device reduces the falling speed of the car 3 during the elevator's descent, while the first buffer device located below the car 3 provides buffering during the descent and upon landing, thus achieving multiple protections for the elevator and its passengers.

[0048] In one implementation, the first buffer device includes a mounting box disposed below the car 3, which is used to provide buffering for the car 3 when it lands.

[0049] The mounting box can be a one-piece design, located at the bottom of the car 3. When the car 3 descends, the mounting box contacts the ground first, providing cushioning. To better achieve cushioning, the mounting box can be filled with flexible materials such as sponge or rubber, or it can also be filled with fluids such as water. Alternatively, the mounting box can have a hollow structure, which can cushion the descent of the car 3 through air resistance.

[0050] By installing a mounting box under the car 3, a buffer is achieved when the car 3 lands, effectively preventing the car 3 from directly contacting the ground below.

[0051] In one implementation, to enhance the cushioning effect, the mounting box includes an upper mounting box 5 located below the car 3 and a lower mounting box 6 located below the upper mounting box 5. This layered cushioning method provides better protection for the car 3.

[0052] The upper mounting box 5 and the lower mounting box 6 provide a double buffer for the car 3 to land.

[0053] In one implementation, such as Figure 3 As shown, to further enhance the cushioning effect, the first cushioning device also includes a second water tank 8 and a hollow rod 7. The lower end of the hollow rod 7 is fixedly installed on the second water tank 8 and communicates with the interior of the second water tank 8. The upper end of the hollow rod 7 passes through the bottom of the lower mounting box 6, and the hollow rod 7 is slidably connected to the lower mounting box 6. When the car 3 lands, the second water tank 8 contacts the ground first, providing initial cushioning. At the same time, the water in the second water tank 8 is drained through the hollow rod 7, effectively relieving pressure in the second water tank 8.

[0054] In one implementation, such as Figure 3As shown, to further enhance the cushioning effect, the first cushioning device also includes a first pressure plate 27, a connecting rod 30, a second pressure plate 29, a rubber block 28, and a sealing piston plate 31. The first pressure plate 27 fits against the inner side of the upper mounting box 5 and is slidably installed inside the upper mounting box 5. The bottom end of the first pressure plate 27 is fixedly connected to the connecting rod 30. The second pressure plate 29 is located below the first pressure plate 27 and is fixedly installed on the inner wall of the upper mounting box 5. The upper end of the second pressure plate 29 is fixedly installed with the rubber block 28. The sealing piston plate 31 is installed in the lower mounting box 6. The connecting rod 30 passes through the rubber block 28 and the second pressure plate 29, and the connecting rod 30 can slide relative to the rubber block 28 and the second pressure plate 29. The lower end of the connecting rod 30 is fixedly connected to the sealing piston plate 31.

[0055] The sealing piston plate 31 provides cushioning when the car 3 lands. When the car 3 lands, the sealing piston plate 31 is compressed upwards, thus providing cushioning for the car 3. The first pressure plate 27 protects the car 3, preventing the connecting rod 30 from damaging it. The second pressure plate 29 guides the connecting rod 30. The rubber block 28 provides further cushioning.

[0056] In one implementation, the first buffer device further includes a first water tank 32 and a third pressure plate 41; the first water tank 32 is disposed below the sealing piston plate 31 and is sealed and fitted inside the lower mounting box 6; the third pressure plate 41 is fixedly installed at the bottom of the first water tank 32, and the third pressure plate 41 is provided with a plurality of connecting grooves 34, which are connected to the first water tank 32; the upper end of the hollow rod 7 is fixedly connected to the third pressure plate 41 and is connected to the connecting grooves 34; a return spring 33 is also fitted on the hollow rod 7, the top end of the return spring 33 is fixedly connected to the third pressure plate 41, and the bottom end of the return spring 33 is fixedly connected to the bottom surface inside the lower mounting box 6.

[0057] The placement of the first water tank 32 adds a layer of landing buffer for the car 3. Simultaneously, its sealed fit within the lower mounting box 6 allows the sealed water tank to exert force on the sealing piston plate 31 when compressed. A hollow rod 7 connects the first water tank 32 and the second water tank 8, enabling water circulation between them. A spring keeps the second water tank 8 in its lower position and also allows it to reset after compression.

[0058] In one implementation, the first buffer device further includes a braking device, which is located on the side of the lower mounting box 6 and is used to brake the descending car 3. The braking device effectively buffers the descent of the car 3.

[0059] In one implementation, such as Figure 5 As shown, the braking device includes a brake housing 9, a connecting oil pipe 36, a piston push plate 37, a limiting block 38, a limiting groove 39, and a connecting spring 40. The brake housing 9 is installed on the side of the lower mounting box 6. The piston push plate 37 is slidably installed inside the brake housing 9. The limiting block 38 is installed on the side of the piston push plate 37 away from the lower mounting box 6. The limiting groove 39 is provided on the brake housing 9 and is used for the passage and guidance of the limiting block 38. The first end of the connecting spring 40 is fixedly installed on the side of the piston push plate 37 away from the lower mounting box 6, and the second end of the piston push plate 37 is fixedly installed on the wall of the brake housing 9 for resetting the piston push plate 37. The connecting oil pipe 36 is installed on the side wall of the lower mounting box 6. The first end of the connecting oil pipe 36 is connected to the cavity between the first water tank 32 and the sealing piston plate 31, and the second end of the connecting oil pipe 36 is connected to the inside of the brake housing 9.

[0060] In one implementation, an oil inlet and an oil outlet are provided on the cavity between the first water tank 32 and the sealing piston plate 31. An oil inlet valve is provided on the oil inlet, and an oil outlet valve is provided on the oil outlet.

[0061] During emergency braking of the car 3, the sealing piston plate 31 is compressed by the car 3, which in turn compresses the hydraulic oil between the first water tank 32 and the sealing piston plate 31. The compressed hydraulic oil then enters the control box through the connecting oil pipe 36, thereby pushing the piston push plate 37 to move. The piston push plate 37 causes the limiting block 38 to extend from the limiting groove 39 and contact the elevator shaft 1, generating friction and thus buffering the car 3 during its descent. The connecting spring 40 assists in resetting the piston push plate 37 after its limiting action is completed.

[0062] In one implementation, to prevent excessive pressure from causing the first water tank 32 to move upwards too far and block the connecting oil pipe 36, or the sealing piston plate 31 to move downwards too far and block the connecting oil pipe 36, a lower limit plate 35 is provided below the connecting oil pipe 36, and an upper limit plate 35 is provided above the pipe. The lower limit plate 35 is used to limit the first water tank 32, and the upper limit plate 35 is used to limit the sealing piston plate 31.

[0063] In one implementation, the lower mounting box 6 is rectangular, and there are four braking devices, which are respectively located on the four outer sides of the lower mounting box 6. Alternatively, there are two braking devices, which are respectively located on the two opposite outer sides of the lower mounting box 6.

[0064] In one implementation, the braking device further includes a mounting plate 10 and a roller 11. The mounting plate 10 is installed on the side of the brake box 9 away from the lower mounting box 6. The mounting plate 10 is provided with a mounting groove, a rotating shaft is installed in the mounting groove, and the roller 11 is installed on the rotating shaft.

[0065] The mounting plate 10 and rollers 11 can reduce the friction between the braking device and the inner wall of the elevator shaft 1.

[0066] In one implementation, the upper mounting box 5 is a box with an opening at the bottom, and the lower mounting box 6 is a box with an opening at the top. The upper mounting box 5 and the lower mounting box 6 are connected by bolts.

[0067] The first buffer device can be easily assembled by setting an opening at the bottom of the upper mounting box 5 and an opening at the top of the lower mounting box 6.

[0068] In one implementation, such as Figure 4 As shown, the second buffer device includes a U-shaped connector 12, a telescopic rod 16, a push plate 17, a brake block 21, and a first friction plate 23. The U-shaped connector 12 is installed on the first buffer device and inserted into the elevator track 2. The U-shaped connector 12 is slidably connected to the elevator track 2. The telescopic rod 16 is fixedly installed on the inner wall of the bottom side of the U-shaped connector 12. The push plate 17 is fixedly installed at the output end of the telescopic rod 16. The brake block 21 is fixedly installed on the push plate 17. The first friction plate 23 is installed on the surface of the brake block 21 near the elevator track 2.

[0069] There can be four elevator tracks 2, which are respectively set at the four opposite corners of the car 3. Correspondingly, there are also four U-shaped connectors 12, which are installed at the four corners of the second water tank 8. In one implementation, to better drive the brake block 21, each U-shaped connector 12 contains two push plates 17, symmetrically arranged on both sides of the brake block 21.

[0070] The push plate 17 is driven by the telescopic rod 16. The push plate 17 drives the brake block 21 to approach the elevator track 2, so that the friction plate on the push plate 17 contacts the elevator track 2, thereby buffering the descent of the car 3.

[0071] In one implementation, the telescopic rod 16 is an electrically operated telescopic rod. In another embodiment, to ensure more stable and smooth movement of the push plate 17, a slider-rail guide device is also provided on the inner wall of the opening of the U-shaped connector 12. The rail is installed on the inner wall of the opening of the U-shaped connector 12, and the slider is installed on the push plate 17. The telescopic rod 16 drives the push plate 17 to move along the rail, thereby driving the push plate 17 to move more stably and smoothly. Alternatively, the guide device on the inner wall of the opening of the U-shaped connector 12 can be configured as a guide block 18 and a guide groove 19. The guide groove 19 is provided on the inner wall of the opening of the U-shaped connector 12, and the guide block 18 is installed in the guide groove 19 and can slide along the guide groove 19. The push plate 17 is fixedly connected to the guide block 18.

[0072] In one implementation, the brake block 21 is T-shaped, and a brake ring 22 is fitted on the protruding end of the brake block 21. A second friction plate is provided on the surface of the brake ring 22 near the elevator track 2, and a first friction plate is provided on the surface of the protruding end of the brake block 21 near the elevator track 2.

[0073] The T-shaped arrangement of the brake block 21 provides further cushioning. When the first friction plate is worn or damaged, the second friction plate 42 on the brake ring 22 can contact the elevator track 2, thereby further cushioning the descent of the car 3.

[0074] In one implementation, a cavity 24 is provided inside the brake block 21, and a piston ring 25 is slidably connected inside the cavity 24. A sliding tube 20 is fixedly connected to the first side of the piston ring 25, and the second end of the sliding tube 20 passes through the brake block 21 and through the U-shaped connector 12 to connect to the water supply. A through hole 26 is provided on the side wall of the brake block 21, and the through hole 26 communicates with the cavity 24.

[0075] In one implementation, the water supply point can be a second water tank 8.

[0076] The sliding tube 20 and through hole 26 are used to cool down the brake block 21 and piston ring 25.

[0077] In one implementation, a through groove 13 is provided on the elevator track 2, and a compression spring 14 is provided in the through groove 13. The outer end of the compression spring 14 is connected to a sliding plate 15.

[0078] The compression spring 14 and the sliding plate 15 ensure that the first friction plate 23 can make stable contact with the elevator track 2. Since the brake block 21 is T-shaped, the end of the brake block 21 is inserted into the through groove 13 to compress the spring 14, which makes the first friction plate make stable contact with the sliding plate 15. At the same time, the second friction plate 42 on the brake ring 22 contacts the elevator track 2 outside the through groove 13, thereby achieving double deceleration and buffering.

[0079] In one implementation, the first buffer device further includes a buffer pad 4, which is disposed below the car 3, and the upper mounting box 5 is installed at the bottom of the buffer pad 4.

[0080] The installation of buffer pad 4 provides further cushioning when the car 3 lands.

[0081] In an emergency, the car 3 descends, and the telescopic rod 16 at the U-shaped connector 12 activates. The telescopic rod 16 drives the push plate 17 to move, which in turn moves the brake block 21. The first friction plate in the brake block 21 contacts the sliding plate 15, and the second friction plate 42 on the brake ring 22 contacts the elevator track 2, thus forming a brake. During braking, the sliding pipe 20 guides the cooling water in the second water tank 8. When the piston ring 25 moves to the side of the through hole 26 near the elevator track 2, the cavity 24 connects with the through hole 26. The water inside the cavity 24 flows along the through hole 26 to the space between the brake ring 22 and the elevator guide rail, cooling the brake ring 22 and ensuring its service life.

[0082] Due to the instantaneous braking of the brake ring 22, the car 3 located above will squeeze the hydraulic oil filled between the sealing piston plate 31 and the first water tank 32. After the hydraulic oil is squeezed, it will cause the piston push plate 37 in the brake box 9 to move, thereby driving the limit block 38 to pass through the limit groove 39, thus fitting with the inner wall of the motor well to form a secondary braking buffer.

[0083] After the second braking, the pressure in the car 3 will compress the buffer pad 4, thus providing cushioning. Through this gradual braking and cushioning, the speed of the car 3 will decrease rapidly. If the elevator comes into contact with the elevator shaft 1 during descent, the water in the second water tank 8 will provide initial cushioning, the rubber block 28 will provide secondary cushioning, and the buffer pad 4 will provide final cushioning, effectively protecting the safety of the people inside the elevator.

[0084] The technical solution provided by this invention reduces the falling speed of the car 3 by using a second buffer device during the elevator's descent, buffers the car 3 when it lands by using a first buffer device located below the car 3, decelerates the elevator's descent by using a brake box 9, and slows down the falling of the car 3 by using a first friction plate and a second friction plate 42. This provides multiple protections for the elevator and its passengers.

[0085] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention described herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the claims.

[0086] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims. The above description is merely illustrative of embodiments of the present invention and is not intended to limit the invention. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An elevator descent buffer device, characterized in that, The elevator descent buffer device includes a car, a first buffer device, a second buffer device, and an elevator track; The first buffer device is disposed below the car and is used to provide cushioning when the car falls and lands. The second buffer device is disposed on the side of the first buffer device and between the elevator track. The second buffer device is used to provide cushioning during the descent of the car along the elevator track. The first buffer device includes a mounting box, which includes an upper mounting box disposed below the car and a lower mounting box disposed below the upper mounting box. The first buffer device further includes a second water tank and a hollow rod; the lower end of the hollow rod is fixedly installed on the second water tank and communicates with the interior of the second water tank, the upper end of the hollow rod passes through the lower mounting box, and the hollow rod is slidably connected to the lower mounting box; The first buffer device further includes a first pressure plate, a connecting rod, a second pressure plate, a rubber block, and a sealing piston plate; the first pressure plate is fitted against the inner side of the upper mounting box and slidably installed inside the upper mounting box, the bottom end of the first pressure plate is fixedly connected to the connecting rod, the second pressure plate is disposed below the first pressure plate and fixedly installed on the inner wall of the upper mounting box, the upper end of the second pressure plate is fixedly installed with a rubber block; the sealing piston plate is installed in the lower mounting box; the connecting rod passes through the rubber block and the second pressure plate, the connecting rod can slide relative to the rubber block and the second pressure plate, and the lower end of the connecting rod is fixedly connected to the sealing piston plate; The first buffer device further includes a first water tank and a third pressure plate; the first water tank is disposed below the sealing piston plate and is sealed and fitted inside the lower mounting box; the third pressure plate is fixedly installed at the bottom of the first water tank, and the third pressure plate is provided with multiple connecting grooves, which communicate with the first water tank; the upper end of the hollow rod is fixedly connected to the third pressure plate and communicates with the connecting grooves; a return spring is also fitted on the hollow rod, the top end of the return spring is fixedly connected to the third pressure plate, and the bottom end of the return spring is fixedly connected to the bottom surface inside the lower mounting box; The second buffer device includes a U-shaped connector, a telescopic rod, a push plate, a brake block, and a first friction plate; The U-shaped connector is installed on the first buffer device and inserted into the elevator track, and the U-shaped connector is slidably connected to the elevator track; The telescopic rod is fixedly installed on the inner wall of the bottom side of the U-shaped connector. A push plate is fixedly installed at the output end of the telescopic rod. A brake block is fixedly installed on the push plate. A first friction plate is installed on the surface of the brake block near the elevator track.

2. The elevator descent buffer device according to claim 1, characterized in that, The mounting box is located below the car and is used to provide cushioning when the car lands.

3. The elevator descent buffer device according to claim 1, characterized in that, The first buffer device further includes a braking device, which is disposed on the side of the lower mounting box and is used to brake the descending car.

4. The elevator descent buffer device according to claim 3, characterized in that, The braking device includes a brake box, a connecting oil pipe, a piston push plate, a limiting block, a limiting groove, and a connecting spring. The brake box is installed on the side of the lower mounting box. The piston pusher plate is slidably mounted inside the brake box. The limiting block is installed on the side of the piston push plate away from the lower mounting box. The limiting groove is provided on the brake box, and the limiting groove is used to allow the limiting block to pass through and guide. The first end of the connecting spring is fixedly installed on the piston push plate away from the lower mounting box side, and the second end of the piston push plate is fixedly installed on the brake box wall for resetting the piston push plate; The connecting oil pipe is installed on the side wall of the lower mounting box. The first end of the connecting oil pipe is connected to the cavity between the first water tank and the sealing piston plate, and the second end of the connecting oil pipe is connected to the brake box.

5. The elevator descent buffer device according to claim 4, characterized in that, The braking device also includes a mounting plate and rollers. The mounting plate is installed on the side of the brake box away from the lower mounting box. The mounting plate is provided with a mounting groove, a rotating shaft is installed in the mounting groove, and the roller is installed on the rotating shaft.

6. The elevator descent buffer device according to claim 1, characterized in that, The upper mounting box is a box with an opening at the bottom, and the lower mounting box is a box with an opening at the top. The upper mounting box and the lower mounting box are connected by bolts.

7. The elevator descent buffer device according to claim 1, characterized in that, The brake block is T-shaped, and a brake ring is fitted on the protruding end of the brake block. A second friction plate is provided on the surface of the brake ring near the elevator track, and the first friction plate is provided on the surface of the protruding end of the brake block near the elevator track.

8. The elevator descent buffer device according to claim 7, characterized in that, The brake block has a cavity, and a piston ring is slidably connected in the cavity. A sliding tube is fixedly connected to the first side of the piston ring, and the second end of the sliding tube passes through the brake block and through the U-shaped connector to connect to the water supply. The brake block has a through hole on its side wall, and the through hole communicates with the cavity.

9. The elevator descent buffer device according to claim 7, characterized in that, The elevator track is provided with a through groove, and a compression spring is installed in the through groove. The outer end of the compression spring is connected to a sliding plate.

10. The elevator descent buffer device according to claim 2, characterized in that, The first buffer device also includes a buffer pad. The buffer pad is located below the car, and the upper mounting box is installed at the bottom of the buffer pad.

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