Anti-falling buffer structure at bottom of elevator car

Abstract

The invention discloses an elevator car bottom anti-falling buffer structure which comprises sliding rails fixed to the two side walls of an elevator shaft and a box body structure installed at the bottom of the elevator shaft and located between the sliding rails on the two sides, and a collision sensor, a controller, a gas generator and an air bag are installed through the box body structure. The collision sensor is connected with the controller, a collision signal is detected through the sensor, the controller controls the gas generator to detonate, the gas generator inflates the gas bag, the gas bag covers the upper portion of the box body structure after being inflated, and a bearing device is installed between the sliding rails on the two sides. The bearing device slides down along the sliding rail and then triggers the collision sensor. The device is safer in buffering and higher in buffering capacity.

Description

Technical Field

[0001] The present invention relates to an anti-falling buffer structure at the bottom of an elevator car. Background Art

[0002] 1. Importance of Elevator Safety

[0003] As an indispensable vertical transportation tool in modern buildings, the safety of elevators is directly related to the life and property safety of passengers. Although elevator systems are usually equipped with multiple safety devices (such as speed limiters, safety tongs, buffers, etc.), in extreme cases (such as wire rope breakage, brake system failure, etc.), it may still lead to car falling accidents. Therefore, the anti-falling buffer structure at the bottom of the car is the last line of defense in the elevator safety system, and its reliability is crucial.

[0004] 2. Limitations of Existing Buffer Technologies

[0005] Currently, the common buffer devices at the bottom of elevator cars mainly include the following types:

[0006] Spring buffer: Absorbs impact energy through the elastic deformation of a metal spring.

[0007] Hydraulic buffer: Utilizes liquid damping to dissipate energy, and has a better buffering effect.

[0008] The above buffer structures generally have the following problems:

[0009] Low energy absorption efficiency: Traditional buffers cannot fully dissipate the huge kinetic energy of the car falling within a short distance, which may cause severe impacts to the passengers in the car.

[0010] Insufficient adaptability: It is difficult to cope with changes in working conditions such as different floor heights and car loads, and the buffering effect is unstable.

[0011] Buffering danger: The spring buffers and hydraulic buffers in the existing technology both buffer at the middle position of the bottom of the car. During the buffering process, the middle position of the bottom of the elevator deforms upward and protrudes into the car, causing personal injuries.

[0012] Based on the above problems, we have designed an anti-falling buffer structure at the bottom of an elevator car that is safer and has stronger buffering ability. Summary of the Invention

[0013] The technical problem to be solved by the present invention is to provide an anti-falling buffer structure at the bottom of an elevator car that is safer and has stronger buffering ability.

[0014] To solve the above problems, the present invention adopts the following technical solutions:

[0015] An anti-fall buffer structure at the bottom of an elevator car comprises slide rails fixed to the two side walls of an elevator shaft, and a box structure installed at the bottom of the elevator shaft and located between the slide rails on both sides. A collision sensor, a controller, a gas generator and an airbag are installed through the box structure. The collision sensor is connected to the controller, and a collision signal is detected by the sensor. The gas generator is controlled to detonate by the controller, and the airbag is inflated by the gas generator. After the airbag is inflated, it covers the upper part of the box structure. A receiving device is installed between the slide rails on both sides, and the receiving device triggers the collision sensor after sliding down along the slide rails.

[0016] Preferably, the slide rail has a T-shaped slide groove, and the receiving device slides along the slide groove.

[0017] Preferably, the box structure includes a box body and a box cover, the box cover is detachably mounted on the top of the box body, an inner steel frame is welded inside the box body, both ends of the inner steel frame are vertically bent downward to form a support portion, the support portion is fixed to the bottom of the box body, the gas generator is mounted on the top of the inner steel frame, a slot is penetrated through the top of the box cover, the airbag is located on the inner side of the slot, and the airbag expands upward through the slot after being inflated, a piston cylinder is mounted inside the box body, a cylinder cover is mounted on the upper end of the piston cylinder, a piston is slidably mounted in the piston cylinder, a piston rod is arranged on the upper end of the piston, the piston rod extends upward to the outside of the cylinder cover, Oil pipes are installed on both sides of the piston cylinder, and pressure relief valves are connected in series on the oil pipes. Buffers are installed at the end of the oil pipes, and the upper ends of the buffers are fixed to the receiving device. An extension bracket is welded to the front end of the inner steel frame, and the collision sensor is fixed to the bottom of the extension bracket. When the buffers on both sides are compressed, the hydraulic oil reaches the pressure relief value of the pressure relief valve and is discharged into the piston cylinder, and drives the piston rod to lift upward and then trigger the collision sensor; an energy absorption box is fixed on the top of the inner steel frame, and the upper end surface of the energy absorption box acts on the box cover, and an oblique support rod is welded to the bottom of the inner frame, and the lower end of the oblique support rod is welded and fixed to the box body.

[0018] Preferably, the receiving device includes a slider and a frame body, the airbag is exposed on the inner side of the frame body, the slider cooperates with the slide rail and slides vertically along the slide rail; the slider is T-shaped and fits into the slide groove.

[0019] Preferably, a lower frame is detachably installed at the bottom of the frame body, and a safety net is sandwiched between the frame body and the lower frame. The sagging depth of the safety net is 20cm to 30cm. Under normal circumstances, the lower end surface of the safety net is more than 80cm away from the upper end surface of the airbag. When the supporting device slides down to trigger the airbag, the height of the lower end surface of the safety net from the airbag is maintained at more than 20cm.

[0020] Preferably, a positioning groove is formed in the inner wall of the sliding groove. A groove is formed in the end face of the slider away from the frame body. A first groove is machined at the bottom of the groove. The width of the first groove is smaller than the width of the groove. An installation hole is vertically penetrated through the top of the slider. The installation hole passes through the first groove. The buffer is installed via the installation hole. A locking screw for locking the buffer is arranged on the outer end face of the slider. A cover plate is detachably installed in the groove. Slots are machined on both sides of the first groove at the bottom of the groove. Positioning blocks are arranged in the slots. A spring is embedded at the inner end face of the positioning block. The spring is welded between the positioning block and the slot. A through groove for passing through the positioning block is machined on the plate surface of the cover plate.

[0021] Preferably, a slope is machined at the bottom position of the positioning block. The upper end face of the positioning block is a plane. When the spring expands, the positioning block is inserted into the positioning groove. When the frame body 72 is subjected to a large impact, the slope slides out of the positioning groove. At this time, the positioning block is pressed and sinks into the through groove.

[0022] Preferably, the buffer includes a first piston cylinder, a first piston rod, a first piston, a limiting sleeve, a first cylinder cover and a first spring; the first piston is formed at the bottom of the first piston rod. The first piston is movably arranged in the first piston cylinder and forms a seal with the inner wall of the first piston cylinder. The first cylinder cover is fixed at the top opening of the first piston cylinder. The first piston rod passes through the first cylinder cover. The limiting sliding sleeve is arranged on the first piston rod. A bolt is arranged between the limiting sleeve and the first piston rod. The first spring is sleeved on the first piston rod. The first spring acts between the limiting sleeve and the cylinder cover. The upper end of the first piston rod penetrates into the installation hole and is locked by the locking screw. The first piston cylinder is fixed to the box body. A connecting pipe is arranged at the bottom position on the side of the first piston cylinder. The oil pipe is docked through the connecting pipe.

[0023] Preferably, a communication groove is machined in the slot and the first groove. Two clamping plates are arranged on the left and right inside the first groove. The clamping plates have inner arc surfaces. The inner arc surfaces are located outside the first piston rod. Friction sheets are fixed on the inner arc surfaces. A plug is machined on the side of the clamping plate away from the inner arc surface. The plug passes through the communication groove. The front end of the plug has a force-receiving slope. A force-applying slope for cooperating with the force-receiving slope is machined at the rear end of the positioning block; when the slider slides down, the positioning block slides out of the positioning groove. At this time, the positioning block compresses the spring and pushes the plug to move outwards. At this time, the two clamping plates on both sides move towards each other and clamp the first piston rod.

[0024] Preferably, a rubber lining is glued and fixed to the inner wall of the groove, and the airbag is contacted through the rubber lining.

[0025] The beneficial effects of the present invention are:

[0026] Advantage 1: This product adopts a double buffer design. The receiving device receives the falling car and completes the first buffer by compressing the buffer. The first buffer includes spring buffer and oil buffer. When the oil is squeezed into the piston cylinder, the collision sensor is triggered to activate the airbag. The activated airbag acts on the lower part of the receiving device to complete the double buffer. Through the above-mentioned double buffer, it can effectively prevent the falling car from a hard fall, protect the internal personnel, and have a higher energy absorption efficiency.

[0027] The second advantage is that the use of large-area airbag cushioning can avoid the situation where the bottom of the elevator car is damaged and invades the interior of the car, compared with the single-point cushioning in traditional technology, and the cushioning is safer.

[0028] Advantage three, the receiving device receives the bottom outer side of the elevator car, which is more reliable. After completing the first buffering, the inflation of the airbag will provide secondary buffering to the car upward through the middle of the receiving device, and the receiving device can also be buffered by the airbag, which makes the buffering safer and more reliable.

[0029] Advantage four: this device can catch people who fall into the elevator shaft through the setting of a safety net.

[0030] Advantage five: the device has a simple structure and reliable buffering, and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a structural schematic diagram of the present invention;

[0033] Figure 2 It is the internal schematic diagram of the box structure;

[0034] Figure 3 is a three-dimensional diagram of the slide rail;

[0035] Figure 4 This is a schematic diagram of the installation of the buffer;

[0036] Figure 5 Isometric view of the receiving device;

[0037] Figure 6 Partial schematic view of the receiving device;

[0038] Figure 7 Exploded view of the structure of the receiving device;

[0039] Figure 8 Enlarged view at A;

[0040] Figure 9 Isometric view of the positioning block;

[0041] Figure 10 Installation schematic view of the clamping plate. Detailed implementation manners

[0042] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

[0043] Any feature disclosed in this specification (including any additional claims, abstract, and drawings), unless specifically stated, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated, each feature is only an example of a series of equivalent or similar features.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "central", "end portion", "length", "outer end", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0045] In addition, in the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0046] In the present invention, unless otherwise clearly defined and limited, the terms "arranged", "socketed", "connected", "penetrated", "plugged in", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] See also Figure 1 and Figure 2 The anti-fall buffer structure at the bottom of an elevator car shown in the figure includes a slide rail 1 fixed at the two side walls of the elevator shaft, and a box structure 2 installed at the bottom of the elevator shaft and located between the slide rails 1 on both sides. A collision sensor 3, a controller 4, a gas generator 5 and an airbag 6 are installed through the box structure 2. The collision sensor 3 is connected to the controller 4, and the collision signal is detected by the sensor 3. The gas generator 5 is controlled to be detonated by the controller 4. The airbag 6 is inflated by the gas generator 5. After the airbag 6 is inflated, it covers the upper part of the box structure 2. A receiving device 7 is installed between the slide rails 1 on both sides. The receiving device 7 triggers the collision sensor 3 after sliding down along the slide rail 1.

[0048] In the above technical solution, the installation position of the slide rail 1 is lower than the position where the elevator car moves downward to the lowest level, so that the device will not cause operation interference during the normal operation of the elevator.

[0049] When the elevator car falls at a high speed and the car's built-in track clamp cannot clamp the track to complete self-locking, the elevator car falls until it contacts the receiving device 7. The huge impact force causes the collision sensor 3 to be excited, and the gas generator 5 is controlled by the controller 4 to explode, and the airbag 6 is inflated within 60 milliseconds. After the airbag 6 is inflated, a buffer is formed under the receiving device 7, which helps the car complete the buffer and reduce the loss caused by hard collision.

[0050] See also Figure 3 As shown, the slide rail 1 has a T-shaped slide groove 11 , and the receiving device 7 slides along the slide groove 11 .

[0051] The T-shaped slide groove 11 is adopted so that the receiving device 7 can only be displaced vertically.

[0052] See also Figure 1 and Figure 2As shown, the box structure 2 includes a box body 21 and a box cover 22, the box cover 22 is detachably mounted on the top of the box body 21, an inner steel frame 23 is welded inside the box body 21, both ends of the inner steel frame 23 are vertically bent downward to form a support portion 233, the support portion 233 is fixed to the bottom of the box body 21, the gas generator 5 is mounted on the top of the inner steel frame 23, a slot 24 is penetrated through the top of the box cover 22, the airbag 6 is located on the inner side of the slot 24, and the airbag 6 expands upward through the slot 24 after being inflated, a piston cylinder 25 is mounted inside the box body 21, a cylinder cover 26 is mounted on the upper end of the piston cylinder 25, a piston (not shown) is slidably mounted in the piston cylinder 25, a piston rod 27 is arranged on the upper end of the piston, the piston rod 27 extends upward to the outside of the cylinder cover 26, and the piston rod 27 extends upward to the outside of the cylinder cover 26. Oil pipes 28 are installed on both sides of the piston cylinder 25, and a pressure relief valve 29 is connected in series on the oil pipe 28. A buffer 210 is installed at the end of the oil pipe 28, and the upper end of the buffer 210 is fixed to the receiving device 7. An extension bracket 231 is welded to the front end of the inner steel frame 23, and the collision sensor 3 is fixed to the bottom of the extension bracket 231. When the buffers 210 on both sides are compressed, the hydraulic oil reaches the pressure relief value of the pressure relief valve 29 and is discharged into the piston cylinder 25, and drives the piston rod 27 to lift upward and trigger the collision sensor 3; an energy absorption box 2331 is fixed on the top of the inner steel frame 23, and the upper end surface of the energy absorption box 2331 acts on the box cover 22, and a diagonal support rod 2332 is welded to the bottom of the inner frame 23, and the lower end of the diagonal support rod 2332 is welded and fixed to the box body 21.

[0053] In the above technical solution, the inner steel frame 23 is used for internal support, so that when the receiving device 7 and the elevator car are impacted downward, the ability of the box structure 2 to resist impact deformation can be increased.

[0054] When the elevator car falls and contacts the receiving device 7, the greater impact force drives the receiving device 7 to move downward and compresses the buffer 210. The buffer 210 has oil inside. When the buffer 210 is compressed, the oil in the buffer 210 is discharged into the piston cylinder 25 after being depressurized by the pressure relief valve 29, and lifts the piston upward, so that the piston rod 27 moves upward and impacts the collision sensor 3. The collision sensor 3 transmits the impact signal to the controller 4. The controller 4 controls the gas generator 5 to explode and instantly completes the inflation of the airbag 6, so that the airbag 6 can be received under the receiving device 7.

[0055] In the above technical solution, a diagonal brace 2332 is also used to further increase the vertical force bearing capacity of the inner steel frame 23.

[0056] In the above technical solution, the design of the energy absorption box 2331 is also adopted. After the airbag 6 is inflated, it will cover the top of the box cover 22. During the process of the airbag 6 bearing the impact, the box body 21 and the box cover 22 are stressed, and the downward impact force received by the box cover 22 can be buffered through the energy absorption box 2331.

[0057] Refer to Figures 3 to 6 As shown, the receiving device 7 includes a slider 71 and a frame body 72. The airbag 6 is exposed inside the frame body 72. The slider 71 cooperates with the slide rail 1 and slides vertically along the slide rail 1; the slider 71 is T-shaped and fits into the chute 11.

[0058] In the above technical solution, the design method of the frame body 72 is adopted. After the airbag 6 is quickly inflated, it can partially bulge upward to the upper part of the frame body 72 to buffer the bottom of the elevator car.

[0059] Moreover, this design method of the frame can avoid impacting the middle position of the elevator car when the elevator car drops to contact the frame body 72.

[0060] The elevator car is of a cage design, and the structural stiffness at its four sides is higher and the impact resistance is the strongest. By contacting the frame body 72 through the strongest part of the elevator car, the deformation during the impact contact of the elevator car can be reduced.

[0061] Refer to Figure 5 As shown, a lower frame 73 is detachably installed at the bottom of the frame body 72. A safety net 74 is clamped between the frame body 72 and the lower frame 73. The depth of the hanging safety net 74 is 20 cm to 30 cm. Under normal conditions, the lower end surface of the safety net 74 is more than 80 cm away from the upper end surface of the airbag 6. When the receiving device 7 slides down to activate the airbag 6, the distance between the lower end surface of the safety net 74 and the airbag 6 remains more than 20 cm.

[0062] In the above technical solution, the structural form of clamping the safety net 74 with the lower frame 73 has two advantages:

[0063] First, when someone falls into the elevator shaft, the safety net 74 can catch the person to avoid direct death from falling to the ground.

[0064] Second, there will inevitably be sharp objects at the bottom of the elevator car. The safety net 74 can play a certain spacer role to prevent the bottom surface of the elevator car from directly contacting the safety net 74 and puncturing the airbag 6.

[0065] The safety net 74 has sufficient margin in design and does not affect the airbag 6 from passing through the middle of the frame body 72 after inflation.

[0066] Refer toFigures 3 to 8 As shown, a positioning groove 121 is formed in the inner wall of the sliding groove 11. A groove 710 is formed in the end face of the slider 71 away from the frame body 72. A first groove 711 is machined at the bottom of the groove 710. The width of the first groove 711 is smaller than the width of the groove 710. An installation hole 712 is vertically penetrated through the top of the slider 71. The installation hole 712 passes through the first groove 711. The buffer 210 is installed via the installation hole 712. A locking screw 713 for locking with the buffer 210 is arranged on the outer end face of the slider 71. A cover plate 714 is detachably installed in the groove 710. Slots 715 are machined on both sides of the first groove 711 at the bottom of the groove 710. A positioning block 716 is arranged in the slots 715. A spring 717 is embedded at the inner end face of the positioning block 716. The spring 717 is welded between the positioning block 716 and the slots 715. A through groove 718 for passing through the positioning block 716 is machined on the plate surface of the cover plate 714.

[0067] In the above technical solution, with the design of the positioning groove 121 and the positioning block 716, when the safety net 74 bears a small fall of a person, the slider 71 will not slide off, avoiding mis-triggering of the airbag 6.

[0068] Refer to Figure 3 、 Figure 7 and Figure 9 As shown, a slope 719 is machined at the bottom position of the positioning block 716. The upper end face of the positioning block 716 is a plane. When the spring 717 is stretched, the positioning block 716 is inserted into the positioning groove 121. When the frame body 72 bears a large impact, the slope 719 slides out of the positioning groove 121. At this time, the positioning block 716 is pressed and sinks into the through groove 718.

[0069] With the design of the slope 719, when the frame body 72 bears a large impact, it is avoided that the positioning block 716 slides inwards, facilitating the downward sliding of the slider 71.

[0070] Refer to Figure 2 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 10As shown, the buffer 210 includes a first piston cylinder 2101, a first piston rod 2102, a first piston 2103, a limit sleeve 2104, a first cylinder cover 2105, and a first spring 2106; the first piston 2103 is formed at the bottom of the first piston rod 2102, the first piston 2103 is movably arranged in the first piston cylinder 2101, and forms a seal with the inner wall of the first piston cylinder 2101. The first cylinder cover 2105 is fixed at the top opening of the first piston cylinder 2101, the first piston rod 2102 passes through the first cylinder cover 2105, the limit sliding sleeve 2104 is arranged on the first piston rod 2102, a bolt 2107 is fitted between the limit sleeve 2104 and the first piston rod 2102, the first spring 2106 is sleeved on the first piston rod 2102, the first spring 2106 acts between the limit sleeve 2104 and the cylinder cover 2105, the upper end of the first piston rod 2102 penetrates into the mounting hole 712 and is locked by the locking screw 713. The first piston cylinder 2101 is fixed to the box body 21. A connecting pipe 2111 is arranged at the bottom position on the side of the first piston cylinder 2101, and the oil pipe 28 is docked through the connecting pipe 2111.

[0071] In the above technical solution, the elastic force provided by the first spring 2106 can keep the first piston rod 2102 in the upper limit position, so that when the frame body 72 bears the impact of the car, the first piston rod 2102 has enough downward movement space.

[0072] When the frame body 72 bears the impact, the slider 71 slides down, and the first piston rod 2102 retracts after being pressed. During the retraction process, energy is absorbed through the compression of the hydraulic oil and the first spring 2106, playing a role in buffering the fall of the car.

[0073] At the same time, the downward movement of the first piston rod 2102 squeezes the hydraulic oil, so that the hydraulic oil enters the piston cylinder after breaking through the limit of the pressure relief valve, causing the piston rod to impact the collision sensor 3 after rising, and completing the activation of the airbag 6.

[0074] Refer to Figure 8 、 Figure 9 and Figure 10As shown in the figure, communication grooves 721 are machined in the slot 715 and the first groove 711. Inside the first groove 711, two clamping plates 722 are arranged on the left and right. The clamping plates 722 have inner arc surfaces. The inner arc surfaces 722 are located outside the first piston rod 2102. Friction plates 723 are fixed on the inner arc surfaces 722. On the side of the clamping plate 722 away from the inner arc surface, a plug 724 is machined. The plug 724 passes through via the communication groove 721. The front end of the plug 724 has a force-receiving inclined surface 725. The rear end of the positioning block 716 is machined with a force-applying inclined surface 726 that matches the force-receiving inclined surface 725. When the slider 71 slides down, the positioning block 716 slides out of the positioning groove 121. At this time, the positioning block 716 compresses the spring 717 and pushes the plug 724 to move outward. At this time, the two clamping plates 722 on both sides move towards each other and clamp the first piston rod 2102.

[0075] In the above technical solution, when the frame body 72 is impacted by the elevator car, the slider 71 slides down, causing the positioning block 716 to slide out of the positioning groove 121. After sliding out, the positioning block 716 moves inward and presses the plug 724, causing the plug 724 to move outward, and clamping the first piston rod 2102 through the clamping plate 722, increasing the fixing firmness between the slider 71 and the first piston rod 2102, and helping the locking screw 713 to bear force.

[0076] When the impact force is too large, resulting in the fracture of the locking screw 713 and the failure of the clamping plate 722 at the same time, the slider 71 is limited by the limit sleeve 2104 after sliding down.

[0077] Refer to Figure 2 As shown in the figure, a rubber inner lining 241 is glued and fixed on the inner wall of the grooving 24, and the airbag 6 is contacted through the rubber inner lining 241.

[0078] The rubber inner lining 241 can prevent the airbag 6 from being damaged.

[0079] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-falling buffer structure at the bottom of an elevator car, characterized in that: The invention comprises a slide rail (1) fixed to the two side walls of an elevator shaft, and a box structure (2) installed at the bottom of the elevator shaft and located between the two side slide rails (1); a collision sensor (3), a controller (4), a gas generator (5) and an air bag (6) are installed through the box structure (2); the collision sensor (3) is connected to the controller (4); a collision signal is detected by the sensor (3); the gas generator (5) is controlled to be detonated by the controller (4); the air bag (6) is inflated by the gas generator (5); the air bag (6) covers the upper part of the box structure (2); a receiving device (7) is installed between the two side slide rails (1); the receiving device (7) triggers the collision sensor (3) after sliding down along the slide rail (1).

2. The anti-falling buffer structure at the bottom of the elevator car according to claim 1, characterized in that: The slide rail (1) has a T-shaped slide groove (11), and the receiving device (7) slides along the slide groove (11).

3. The anti-falling buffer structure at the bottom of the elevator car according to claim 2, wherein: The box structure (2) comprises a box (21) and a box cover (22), wherein the box cover (22) is detachably mounted on the top of the box (21), an inner steel frame (23) is welded inside the box (21), both ends of the inner steel frame (23) are vertically bent downward to form a support portion (233), and the support portion (233) is fixed to the bottom of the box (21), the gas generator (5) is mounted on the top of the inner steel frame (23), and the box cover (22) is mounted on the top of the inner steel frame (23). ) is penetrated through the top of the housing (21), the airbag (6) is located on the inner side of the groove (24), and the airbag (6) expands upward through the groove (24) after being inflated. A piston cylinder (25) is installed inside the housing (21), and a cylinder cover (26) is installed on the upper end of the piston cylinder (25). A piston is slidably installed in the piston cylinder (25), and a piston rod (27) is provided on the upper end of the piston. The piston rod (27) extends upward to the outside of the cylinder cover (26). Oil pipes (28) are installed on both sides of the cylinder (25), and pressure relief valves (29) are connected in series to the oil pipes (28). Buffers (210) are installed at the ends of the oil pipes (28). The upper ends of the buffers (210) are fixed to the receiving device (7). An extension bracket (231) is welded to the front end of the inner steel frame (23). The collision sensor (3) is fixed to the bottom of the extension bracket (231). When the buffers (210) on both sides are compressed, the hydraulic oil reaches the relief valve (29). The pressure relief value of the pressure valve (29) is discharged into the piston cylinder (25), and the piston rod (27) is driven to lift upward to trigger the collision sensor (3); an energy absorption box (2331) is fixed on the top of the inner steel frame (23), and the upper end surface of the energy absorption box (2331) acts on the box cover (22); an oblique support rod (2332) is welded to the bottom of the inner frame (23), and the lower end of the oblique support rod (2332) is welded and fixed to the box body (21).

4. The anti-falling buffer structure at the bottom of the elevator car according to claim 3, wherein: The receiving device (7) includes a slider (71) and a frame body (72). The airbag (6) is exposed inside the frame body (72). The slider (71) cooperates with the slide rail (1) and slides vertically along the slide rail (1). The slider (71) is T-shaped and fits into the chute (11).

5. The anti-falling buffer structure at the bottom of the elevator car according to claim 4, characterized in that: A lower frame (73) is detachably installed at the bottom of the frame body (72). A safety net (74) is clamped between the frame body (72) and the lower frame (73). The depth at which the safety net (74) hangs down is 20 cm to 30 cm.

6. The anti-falling buffer structure at the bottom of the elevator car according to claim 4, wherein: A positioning groove (121) is formed in the inner wall of the chute (11). A groove (710) is formed at the end face of the slider (71) away from the frame body (72). A first groove (711) is machined at the bottom of the groove (710). The width of the first groove (711) is smaller than the width of the groove (710). An installation hole (712) penetrates vertically through the top of the slider (71). The installation hole (712) passes through the first groove (711). The buffer (210) is installed through the installation hole (712). A locking screw (713) for locking with the buffer (210) is provided on the outer end face of the slider (71). A cover plate (714) is detachably installed in the groove (710). Slots (715) are machined on both sides of the first groove (711) at the bottom of the groove (710). A positioning block (716) is arranged in the slots (715). A spring (717) is embedded at the inner end face of the positioning block (716). The spring (717) is welded between the positioning block (716) and the slots (715). A through groove (718) for passing through the positioning block (716) is machined on the plate surface of the cover plate (714).

7. The anti-falling buffer structure at the bottom of the elevator car according to claim 6, wherein: A slope (719) is machined at the bottom position of the positioning block (716). The upper end face of the positioning block (716) is a flat surface. When the spring (717) is stretched, the positioning block (716) is inserted into the positioning groove (121). When the frame body (72) bears a large impact, the slope (719) slides out of the positioning groove (121). At this time, the positioning block (716) is pressed and sinks into the through groove (718).

8. The anti-falling buffer structure at the bottom of the elevator car according to claim 6, characterized in that: The buffer (210) includes a first piston cylinder (2101), a first piston rod (2102), a first piston (2103), a limit sleeve (2104), a first cylinder head (2105), and a first spring (2106); the first piston (2103) is formed at the bottom of the first piston rod (2102), the first piston (2103) is movably arranged in the first piston cylinder (2101), and forms a seal with the inner wall of the first piston cylinder (2101), the first cylinder head (2105) is fixed at the top opening of the first piston cylinder (2101), the first piston rod (2102) passes through the first cylinder head (2105), the limit sliding sleeve (2104) is arranged on the first piston rod (2102), a bolt (2107) is fitted between the limit sleeve (2104) and the first piston rod (2102), the first spring (2106) is sleeved on the first piston rod (2102), the first spring (2106) acts between the limit sleeve (2104) and the cylinder head (2105), the upper end of the first piston rod (2102) penetrates into the mounting hole (712) and is locked by the locking screw (713), the first piston cylinder (2101) is fixed to the box body (21), and a connecting pipe (2111) is arranged at the bottom position on the side of the first piston cylinder (2101), and the oil pipe (28) is docked through the connecting pipe (2111).

9. The anti-falling buffer structure at the bottom of the elevator car according to claim 8, wherein: A communication groove (721) is processed in the slot (715) and the first groove (711), two clamping plates (722) are arranged on the left and right inside the first groove (711), the clamping plates (722) have inner arc surfaces, the inner arc surface (722) is located outside the first piston rod (2102), a friction plate (723) is fixed on the inner arc surface (722), the side of the clamping plate (722) away from the inner arc surface is processed with an insertion block (724), the insertion block (724) passes through the communication groove (721), the front end of the insertion block (724) has a force-receiving inclined surface (725), and the rear end of the positioning block (716) is processed with a force-applying inclined surface (726) that matches the force-receiving inclined surface (725); when the slider (71) slides down, the positioning block (716) slides out of the positioning groove (121), at this time the positioning block (716) compresses the spring (717) and pushes the insertion block (724) to move outward, and at this time the two clamping plates (722) on both sides move towards each other and clamp the first piston rod (2102).

10. The anti-falling buffer structure at the bottom of the elevator car according to claim 3, wherein: A rubber inner lining (241) is glued and fixed to the inner wall of the slot (24), and the airbag (6) is contacted through the rubber inner lining (241).

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