A foundationless elevator car buffer device

Abstract

The application relates to the technical field of elevator safety protection equipment, and discloses a pit-free elevator car buffer device, which comprises an elevator shaft and a channel steel support, opposite installation side plates are arranged in the installation grooves at the lower ends of the two sides of the elevator shaft, spring steel plates are rotationally connected between the installation side plates, fulcrum assemblies are arranged on the lower end horizontal plates of the spring steel plates, auxiliary pulley assemblies are arranged between the installation side plates, a first steel wire rope is arranged at the lower end of the elevator shaft, the two ends of the first steel wire rope are wound around the auxiliary pulley assemblies and connected with the fulcrum assemblies, and a channel steel support with a hooking assembly is arranged on the top of the elevator car. When the car falls, the middle section of the first steel wire rope is pressed downwards, the two ends of the first steel wire rope are wound around the auxiliary pulley assemblies to pull the spring steel plates to rotate and hook the hooking assembly, so that buffering is realized; after the car rises, the assembly is automatically reset. The pit-free elevator car buffer device is compact in structure, the buffering stroke is adjustable, and is suitable for space-limited occasions such as old building elevator installation.

Description

Technical Field

[0001] This invention relates to the field of elevator safety protection equipment technology, specifically to a pitless elevator car buffer device. Background Technology

[0002] Traditional elevator buffer devices typically require a pre-excavated pit at the bottom of the elevator shaft, within which spring or hydraulic buffers are installed to provide cushioning protection in the event of an elevator car fall or overtravel. However, this pit-dependent design has significant shortcomings: First, pit excavation increases the complexity and cost of civil engineering, and in some older buildings retrofitting elevators or in situations with limited geological conditions, it is difficult to implement due to the inability to meet pit depth requirements; second, the buffer stroke of traditional buffers is limited by the pit depth, resulting in poor adaptability to elevators with different loads and speeds, and adjustments are difficult after installation; furthermore, the reset structure of existing buffer devices after buffering is often complex, making maintenance inconvenient. Therefore, there is an urgent need to develop an elevator car buffer device that requires no pit, has a compact structure, and is highly adaptable. Summary of the Invention

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a pitless elevator car buffer device to solve the problems of limited buffer stroke and poor adaptability to different elevators in existing elevator car buffer devices.

[0004] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a pitless elevator car buffer device, comprising an elevator shaft and a channel steel support. Mounting grooves are provided on both sides of the lower end of the elevator shaft, and mounting side plates are provided within each mounting groove. Two mounting side plates are configured and positioned opposite each other on the inner walls of the mounting grooves. A spring steel plate is provided between the mounting side plates, and a horizontal plate is provided at both ends of the spring steel plate. The spring steel plate is rotatably connected to the mounting side plates on both sides via a rotating shaft. A stop block is provided between the mounting side plates, located on the side of the lower end of the spring steel plate away from the elevator pit. A fulcrum assembly is provided on the horizontal plate at the lower end of the spring steel plate. An auxiliary pulley assembly is also provided between the mounting side plates. A first steel wire rope is provided at the lower end of the elevator shaft, with both ends of the first steel wire rope passing around the auxiliary pulley assemblies on both sides of the inner wall of the elevator shaft and fixedly connected to the fulcrum assembly. The channel steel support is located at both ends of the top of the elevator car, and a hooking assembly is provided on the channel steel support that can be hooked by the horizontal plate at one end of the spring steel plate.

[0005] Preferably, the auxiliary pulley assembly includes a first auxiliary shaft and a second auxiliary shaft. The second auxiliary shaft is disposed below the stop block and a second auxiliary pulley is disposed on the second auxiliary shaft. The first auxiliary shaft is disposed below the second auxiliary shaft and near the elevator shaft, and a first auxiliary pulley is disposed on the first auxiliary shaft. The end of the first wire rope passes through the first auxiliary pulley and the second auxiliary pulley in sequence and is fixedly connected to the fulcrum assembly.

[0006] Preferably, the fulcrum assembly includes a bearing sleeve and a first fulcrum pulley. A bearing sleeve is provided on the horizontal plate at the lower end of the spring steel plate. Two bearing sleeves are configured and arranged opposite each other. A first fulcrum pulley is provided between the bearing sleeves. The end of the first wire rope passes through the first auxiliary pulley and the second auxiliary pulley in sequence and is fixedly connected to the first fulcrum pulley. A slot is provided on the horizontal plate at the lower end of the spring steel plate near the first fulcrum pulley.

[0007] Preferably, the system further includes a retractable assembly disposed within the mounting groove. The retractable assembly includes a third auxiliary shaft, a spring, a mounting bracket, and a second steel wire rope. The third auxiliary shaft is disposed between the mounting side plates and above the stop block. A third auxiliary pulley is disposed on the third auxiliary shaft. The mounting bracket is disposed on the side of the spring steel plate away from the elevator shaft. Two mounting brackets are configured and arranged opposite each other. A fulcrum shaft is disposed between the mounting brackets. A second fulcrum pulley is disposed on the fulcrum shaft. One end of the spring is fixedly connected to the bottom of the mounting groove, and the other end is fixedly connected to one end of the second steel wire rope. The other end of the second steel wire rope passes around the third auxiliary pulley and is fixedly connected to the second fulcrum pulley.

[0008] Preferably, the mounting assembly includes an adjusting screw and a fixing pin. Fixing plates are provided on both side walls of the channel steel bracket. The adjusting screw passes through the middle of the fixing plate. A first adjusting nut and a second adjusting nut are threaded onto the adjusting screw. The first adjusting nut is located at the bottom of the fixing plate, the second adjusting nut is located at the top of the fixing plate, and the fixing pin is located at the top of the adjusting screw.

[0009] Preferably, each adjusting screw has a collar at its top, and the fixing pin is fitted inside the collar. The side walls of the channel steel bracket are provided with sliding grooves. Both ends of the fixing pin pass through the sliding grooves and are slidably connected to them. One end of the fixing pin is provided with a baffle, and the other end is threaded with a fixing nut.

[0010] Preferably, the spring steel plate is further provided with a plurality of reinforcing steel plates on the side near the elevator shaft, and a U-shaped screw is provided on one side of the reinforcing steel plate. A pressure plate is detachably connected to the opening of the U-shaped screw, and both ends of the top of the U-shaped screw are detachably connected to the bottom of the mounting bracket.

[0011] Preferably, the top two ends of the U-shaped screw extend through both ends of the pressure plate, and the top two ends of the U-shaped screw are threaded with a first fastening nut. The bottom of the mounting bracket is fixedly connected to the top of the second fastening nut, and the bottom of the second fastening nut is threadedly connected to the top of the U-shaped screw.

[0012] Preferably, pull rings are provided below the mounting grooves on both sides of the inner wall of the elevator shaft, and the first steel wire rope is threaded through the pull rings.

[0013] Preferably, it also includes a support plate, which is inserted through the middle section of the first wire rope, and both ends of the support plate on the first wire rope are provided with fixing buckles.

[0014] (III) Beneficial Effects: Compared with the prior art, the present invention has the following beneficial effects: This invention employs a pitless design, integrating the spring steel plate, pulley assembly, and retraction mechanism into the mounting groove on the side wall of the elevator shaft. This eliminates the need for the pit required for traditional buffers at the bottom of the shaft, significantly reducing civil engineering costs and construction difficulty, making it particularly suitable for retrofitting elevators in older buildings and in space-constrained environments. Furthermore, by using a height-adjustable hook assembly consisting of adjusting screws, fixing pins, and sliding grooves, along with adjustable reinforcing steel plates, the buffer stroke and force can be flexibly adjusted according to the car's load and operating speed, adapting to different operating conditions. In addition, an automatic reset mechanism composed of a spring, a second steel wire rope, and a second fulcrum pulley automatically returns the spring steel plate to a standby state after buffering, requiring no manual intervention and ensuring reliable operation. The entire device uses a purely mechanical linkage trigger, utilizing the car's downward pressure on the support plate and pulling the spring steel plate to rotate and hook through the first steel wire rope and multiple sets of pulleys. This provides a sensitive response, is unaffected by electrical faults, and features a compact structure that fully utilizes the space of the shaft side wall and the top of the car, achieving a highly efficient, reliable, and adaptable pitless buffer function. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a perspective view of the internal structure of the present invention; Figure 3 For the present invention Figure 1 Enlarged perspective view of the structure at point A in the middle; Figure 4 For the present invention Figure 2 Enlarged perspective view of the structure at point B; Figure 5 For the present invention Figure 3 Enlarged structural diagram at point C; Figure 6 For the present invention Figure 4 Enlarged structural diagram at point D; Figure 7 For the present invention Figure 2 Enlarged perspective view of the structure at point E in the middle; Figure 8 This is an enlarged side view of the channel steel support structure of the present invention; Figure 9 This is an enlarged structural schematic diagram of the adjusting screw and fixing pin of the present invention.

[0016] The components include: 1. Mounting slot; 101. Mounting side plate; 1011. Stop block; 2. First auxiliary shaft; 201. First auxiliary pulley; 3. Second auxiliary shaft; 301. Second auxiliary pulley; 4. Third auxiliary shaft; 401. Third auxiliary pulley; 5. Spring steel plate; 501. Slot; 502. Bearing sleeve; 503. Reinforcing steel plate; 6. Rotating shaft; 7. First fulcrum pulley; 8. Spring; 9. U-bolt; 901. First fastening nut; 10. Pressure plate; 11. Mounting bracket; 1101, second fastening nut; 12, fulcrum shaft; 1201, second fulcrum pulley; 13, channel steel bracket; 1301, fixing plate; 1302, slide groove; 14, adjusting screw; 1401, first adjusting nut; 1402, second adjusting nut; 15, collar; 16, fixing pin; 1601, baffle; 17, fixing nut; 18, first wire rope; 19, pull ring; 20, support plate; 21, fixing buckle; 22, second wire rope. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1 and Figure 2As shown, the present invention provides a technical solution including an elevator shaft and a channel steel support 13. Mounting grooves 1 are provided on both sides of the lower end of the elevator shaft. Mounting side plates 101 are provided within each mounting groove 1. Two mounting side plates 101 are configured and arranged opposite each other on the inner walls of the mounting grooves 1. A spring steel plate 5 is provided between the mounting side plates 101. Horizontal plates are provided at both ends of the spring steel plate 5. The spring steel plate 5 is rotatably connected to the mounting side plates 101 on both sides via a rotating shaft 6. A stop block 1011 is provided between the mounting side plates 101. The stop block 1011 is located on the side of the lower end of the spring steel plate 5 away from the elevator pit. A fulcrum assembly is provided on the horizontal plate at the lower end of the spring steel plate 5. An auxiliary pulley assembly is also provided between the mounting side plates 101. A first steel wire rope 18 is provided at the lower end of the elevator shaft. The two ends of the first steel wire rope 18 pass around the auxiliary pulley assemblies on both sides of the inner wall of the elevator shaft and are fixedly connected to the fulcrum assembly. The channel steel bracket 13 is located at both ends of the top of the elevator car. A hooking assembly that can be hooked on one end of the horizontal plate of the spring steel plate 5 is provided on the channel steel bracket 13.

[0019] Through the above technical solution, the mounting groove 1 is opened on both sides of the lower end of the elevator shaft, providing a mounting carrier for the mounting side plate 101, realizing the pitless integration of the buffer device; the two mounting side plates 101 arranged opposite each other in the mounting groove 1 serve as the supporting foundation of the entire buffer structure, used to support and fix the spring steel plate 5 and the auxiliary pulley assembly; both ends of the spring steel plate 5 are provided with horizontal plates, and the spring steel plate 5 is rotatably connected to the mounting side plate 101 through the rotating shaft 6. The rotating shaft 6 provides a rotation fulcrum for the spring steel plate 5, so that the spring steel plate 5 can switch between the vertical standby state and the horizontal hooking state around the rotating shaft 6; the stop block 1011 is set on the side of the lower end of the spring steel plate 5 away from the elevator pit, used to limit the spring steel plate 5 when it swings to the horizontal state, to prevent it from swinging excessively; A fulcrum assembly is provided on the horizontal plate at the lower end of the spring steel plate 5 for connecting the first wire rope 18 and transmitting tension; an auxiliary pulley assembly is provided between the mounting side plates 101 for changing the transmission direction of the first wire rope 18 and reducing frictional resistance; the first wire rope 18 is provided at the lower end of the elevator shaft, and its two ends are respectively connected to the fulcrum assembly by passing around the auxiliary pulley assembly on both sides of the inner wall of the elevator shaft. When the middle section of the first wire rope 18 is compressed, its two ends can pull the fulcrum assembly through the auxiliary pulley assembly, thereby driving the spring steel plate 5 to rotate around the rotating shaft 6; The channel steel bracket 13 is set at both ends of the top of the elevator car to provide an installation base for the hook-up components. The hook-up components set on the channel steel bracket 13 are used to cooperate with the horizontal plate at one end of the spring steel plate 5. When the spring steel plate 5 is rotated to a horizontal state, the end of its horizontal plate is hooked on the hook-up components to achieve buffering and support for the falling car.

[0020] like Figure 3 and Figure 4As shown, in some embodiments, the auxiliary pulley assembly includes a first auxiliary shaft 2 and a second auxiliary shaft 3. The second auxiliary shaft 3 is disposed between the mounting side plates 101 and below the stop block 1011, and is used to install and fix the second auxiliary pulley 301, providing a support fulcrum for the transmission of the first wire rope 18 and ensuring the stability of the transmission process. The second auxiliary shaft 3 is provided with the second auxiliary pulley 301, and the first auxiliary shaft 2 is disposed between the mounting side plates 101, below the second auxiliary shaft 3 and close to the elevator shaft, and is used to install and fix the first auxiliary pulley 201, forming an upper structure with the second auxiliary shaft 3. The lower distribution of the support structure is adapted to the laying trajectory of the first wire rope 18. The diameter of the first auxiliary pulley 201 is larger than that of the second auxiliary pulley 301. This size setting can optimize the tension transmission efficiency, so that the tension at the end of the first wire rope 18 can be transmitted to the fulcrum assembly more smoothly, reducing tension loss during the transmission process. The first auxiliary pulley 201 is used to support the end of the first wire rope 18 and guide the direction of the first wire rope 18. The second auxiliary pulley 301 works with the first auxiliary pulley 201 to change the transmission direction of the first wire rope 18. The two work together to ensure smooth transmission of the first wire rope 18. Based on the structure described above, the first steel wire rope 18 installed at the bottom of the elevator shaft can be fixedly connected to the fulcrum assembly by passing the first auxiliary pulley 201 and the second auxiliary pulley 301 in sequence. When the elevator falls out of control, the first steel wire rope 18 is subjected to the pressure of the support plate 20, which generates tension. This tension is initially transmitted through the larger diameter first auxiliary pulley 201, and then after being turned by the second auxiliary pulley 301, it is smoothly transmitted to the fulcrum assembly. This pulls the spring steel plate 5 to swing around the pivot 6 to a lateral state, thereby achieving buffering and limiting of the elevator car. The size design and structural matching of the auxiliary pulley assembly further improve the reliability and stability of the buffering action.

[0021] like Figure 3 and Figure 4 As shown, in some embodiments, three, four, or more auxiliary shafts and corresponding auxiliary pulleys can be set according to the spatial dimensions of the elevator shaft, the routing requirements of the wire rope, and the force distribution. It is only necessary to ensure that the arrangement of each pulley can effectively guide and reverse the wire rope, so that the two ends of the first wire rope 18 can smoothly pull the first fulcrum pulley 7. At the same time, the diameter of each auxiliary pulley can also be flexibly configured according to the force and installation space. A larger diameter pulley can reduce the bending stress of the wire rope, while a smaller diameter pulley is convenient for compact layout. The combination of multiple pulleys can further optimize the transmission path of the wire rope, reduce frictional resistance, and ensure the reliability and smoothness of the triggering action.

[0022] like Figure 1 , Figure 2 and Figure 6As shown, in some embodiments, the fulcrum assembly includes a bearing sleeve 502 and a first fulcrum pulley 7. Through the above technical solution, the bearing sleeve 502 is disposed on the horizontal plate at the lower end of the spring steel plate 5, with two sleeves arranged opposite each other, for mounting the first fulcrum pulley 7 and reducing its frictional resistance during rotation, ensuring smooth transmission. The first fulcrum pulley 7 disposed between the bearing sleeves 502 serves as the point of application of the tension of the first wire rope 18. When the first wire rope 18 is subjected to tension, the first fulcrum pulley 7 transmits the tension to the horizontal plate at the lower end of the spring steel plate 5, thereby driving the spring steel plate 5 to rotate around the shaft 6. The slot 501 is disposed on the horizontal plate at the lower end of the spring steel plate 5 near the end of the first fulcrum pulley 7, for providing clearance space for the connection and movement of the first wire rope 18, avoiding interference between the wire rope and the spring steel plate 5 during pulling, and ensuring the smoothness and reliability of the triggering action.

[0023] like Figure 3 and Figure 4 As shown, in some embodiments, the retractable assembly includes a third auxiliary shaft 4, a spring 8, a mounting bracket 11, and a second wire rope 22. The third auxiliary shaft 4 is disposed between the mounting side plates 101 and above the stop block 1011, and is used to mount and fix the third auxiliary pulley 401, providing a support fulcrum for the transmission of the second wire rope 22. The third auxiliary shaft 4 is provided with a third auxiliary pulley 401, which changes the transmission direction of the second wire rope 22, reduces the friction during the transmission of the second wire rope 22, and ensures smooth force transmission and low loss. Two mounting brackets 11 are configured and are positioned opposite each other on the side of the spring steel plate 5 away from the elevator shaft. A fulcrum shaft 12 is provided between the mounting brackets 11, and a second fulcrum pulley 1201 is provided on the fulcrum shaft 12. Wheel 1201 is used to connect the second wire rope 22, converting the tension transmitted by the second wire rope 22 into the power to drive the spring steel plate 5 to swing. One end of the spring 8 is fixedly connected to the bottom of the mounting groove 1, and the other end is fixedly connected to one end of the second wire rope 22. The other end of the second wire rope 22 passes around the third auxiliary pulley 401 and is fixedly connected to the second fulcrum pulley 1201. When the elevator car resumes its ascent and releases the pressure on the support plate 20, the spring 8 contracts to generate tension, which is transmitted to the third auxiliary pulley 401 through the second wire rope 22. After the third auxiliary pulley 401 changes direction, it acts on the second fulcrum pulley 1201, thereby pulling the spring steel plate 5 to swing around the pivot 6 to return to the longitudinal state, realizing the automatic reset of the buffer structure without manual intervention, ensuring that the device can be reused.

[0024] like Figures 7-9As shown, in some embodiments, the mounting assembly includes an adjusting screw 14 and a fixing pin 16. Fixing plates 1301 are provided on both side walls of the channel steel bracket 13. The fixing plates 1301 provide mounting support for the adjusting screw 14, ensuring stable installation and vertical adjustment. The adjusting screw 14 passes through the middle of the fixing plate 1301, serving as the core of the mounting assembly's adjustment mechanism. It drives the fixing pin 16 to achieve height adjustment, adapting to the buffering requirements of different elevator car sizes. A first adjusting nut 1401 and a second adjusting nut 1402 are threaded onto the adjusting screw 14. The first adjusting nut 1401 is located at the bottom of the fixed plate 1301, and the second adjusting nut 1402 is located at the top of the fixed plate 1301. The two adjusting nuts work together to lock the adjusting screw 14. After the adjusting screw 14 is adjusted to a suitable height, tightening the first adjusting nut 1401 and the second adjusting nut 1402 can fix the adjusting screw 14 on the fixed plate 1301 and prevent it from loosening. The fixing pin 16 is located at the top of the adjusting screw 14 and is used to cooperate with the horizontal plate at the upper end of the spring steel plate 5. When the spring steel plate 5 swings to the horizontal state, its end horizontal plate hooks onto the fixing pin 16 to achieve buffering and limiting of the elevator car.

[0025] Furthermore, both side walls of the channel steel bracket 13 are provided with sliding grooves 1302, which provide a sliding path for the fixing pin 16, allowing the fixing pin 16 to slide longitudinally along the sliding groove 1302. This facilitates adjustment of the longitudinal position of the fixing pin 16 and better adapts to the hooking path of the spring steel plate 5. Each adjusting screw 14 has a collar 15 at its top, which is used to fit the fixing pin 16, connecting the fixing pin 16 to the adjusting screw 14. One end of the fixing pin 16 is provided with a baffle 1601, which prevents the fixing pin 16 from slipping off the collar 1601. 5. The pin 16 is detached from the slide groove 1302 to ensure reliable connection. The other end of the fixing pin 16 is threaded with a fixing nut 17, which is used to lock the fixing pin 16. After the fixing pin 16 is adjusted to a suitable longitudinal position, tightening the fixing nut 17 can fix the fixing pin 16 and prevent it from sliding freely. The fixing pin 16 is slidably connected to the slide groove 1302, so that the fixing pin 16 can be flexibly adjusted in longitudinal position according to actual needs, further improving the adaptability of the hanging component, ensuring that the spring steel plate 5 can be accurately hooked, and ensuring the reliability of the buffering effect.

[0026] like Figure 7 and Figure 9As shown, in some embodiments, the connection between the fixing pin 16 and the top of the adjusting screw 14 can be welded to ensure a firm connection and withstand the impact force when the spring steel plate 5 is hooked; alternatively, it can be manufactured using an integral molding process to improve structural strength and reliability; or it can be detachably assembled using a threaded connection for easy maintenance and replacement later. The most suitable fixing method can be selected according to the actual working conditions, ensuring hook reliability while also considering processing convenience and maintenance ease.

[0027] like Figures 3-5 As shown, in some embodiments, the spring steel plate 5 near the rotating shaft 6 is further provided with multiple reinforcing steel plates 503. The reinforcing steel plates 503 are fitted together with the spring steel plate 5, and their core function is to enhance the structural strength and load-bearing capacity of the spring steel plate 5, preventing the spring steel plate 5 from deforming or breaking when subjected to the impact force of the elevator car falling. At the same time, the number and strength of the reinforcing steel plates 503 can be flexibly adjusted according to the weight of the elevator car and the impact force, further improving the reliability and adaptability of the buffer structure. The U-shaped screw 9 is sleeved on the outside of the reinforcing steel plate 503 and the spring steel plate 5, and is used to fasten the reinforcing steel plate 503 to the spring steel plate 5, ensuring that the two are tightly connected and synchronously stressed, avoiding relative sliding that would affect the reinforcement effect; the pressure plate 10 is used to press the open end of the U-shaped screw 9, and works with the U-shaped screw 9 to firmly clamp the reinforcing steel plate 503 and the spring steel plate 5, improving the stability of the connection.

[0028] Both ends of the top of the U-shaped screw 9 are threaded with a first fastening nut 901. The first fastening nut 901 is used to lock the pressure plate 10. Tightening the first fastening nut 901 can fix the pressure plate 10 to the U-shaped screw 9, thereby making the connection between the U-shaped screw 9 and the reinforcing steel plate 503 and the spring steel plate 5 more secure and preventing loosening. The bottom of the mounting bracket 11 is fixedly connected to the top of the second fastening nut 1101. The bottom of the second fastening nut 1101 is threaded to the top of the U-shaped screw 9. The second fastening nut 1101 serves as the connection medium between the mounting bracket 11 and the U-shaped screw 9, realizing a detachable connection between the two. This facilitates the disassembly and replacement of parts during installation and later maintenance, while ensuring the reliability of the connection.

[0029] like Figure 1 and Figure 2 As shown, in some embodiments, pull rings 19 are provided below the side plates 101 installed on both sides of the inner wall of the elevator shaft. The pull rings 19 are fixedly installed on the inner wall of the elevator shaft. Their core function is to limit and support the first wire rope 18, so as to prevent the first wire rope 18 from deviating or shaking under force or natural state, and to ensure that the first wire rope 18 always stays on the preset transmission trajectory, so as to ensure the stability of its cooperation with the auxiliary pulley assembly and the first fulcrum pulley 7, thereby ensuring the smooth realization of the buffer action. A support plate 20 is threaded through the middle section of the first wire rope 18. The support plate 20 serves as a triggering component when the elevator car falls out of control. When the elevator car exceeds the set descent position, the bottom of the car will press down on the support plate 20, causing the support plate 20 to exert downward pressure on the first wire rope 18. This, in turn, causes tension at both ends of the first wire rope 18, triggering the subsequent buffering action of the spring steel plate 5. This is a key component for the automatic triggering of the buffering device. Both ends of the support plate 20 on the first wire rope 18 are provided with fixing buckles 21. The fixing buckles 21 are fastened to the first wire rope 18 to limit and fix the support plate 20, preventing it from sliding on the first wire rope 18. This ensures that the support plate 20 is always in the middle position of the first wire rope 18, guaranteeing that the support plate 20 can be accurately pressed down when the elevator car falls, triggering the buffering action. At the same time, it prevents the support plate 20 from shifting, which would affect the reliability of the buffering effect.

[0030] The working principle of this invention is: When the elevator is running normally, the spring steel plate 5 is kept vertically in standby position by the tension of the spring 8 of the retraction assembly through the second wire rope 22 and the second fulcrum pulley 1201. At this time, the support plate 20 of the middle section of the first wire rope 18 is suspended below the car. When the elevator falls out of control and the car exceeds the set lower limit position, the bottom of the car first presses against the support plate 20. The support plate 20 is then pressed down on the middle section of the first wire rope 18, causing a downward tension at both ends of the first wire rope 18. This tension is limited by the pull ring 19. After guidance, the first auxiliary pulley 201 and the second auxiliary pulley 301 are sequentially reversed and transmitted, pulling the first fulcrum pulley 7 which is fixedly connected to the end of the first steel wire rope 18. The first fulcrum pulley 7 drives the spring steel plate 5 to rotate around the rotating shaft 6 towards the inside of the elevator shaft until the lower horizontal plate of the spring steel plate 5 abuts against the stop block 1011 for limitation. At this time, the spring steel plate 5 changes from a vertical state to a horizontal hook state, and its upper horizontal plate hooks onto the fixing pin 16 on the channel steel bracket 13 at the top of the car, so as to achieve buffering and support for the falling car. When the elevator malfunction is resolved and the car resumes its ascent, the bottom of the car is released from the pressure on the support plate 20, and the tension of the first wire rope 18 is released. At this time, the tension of the spring 8 pulls the second fulcrum pulley 1201 through the second wire rope 22 and the third auxiliary pulley 401, which in turn drives the spring steel plate 5 to rotate in the opposite direction around the rotating shaft 6, so that it automatically returns from the horizontal hook state to the vertical standby state, completing the automatic reset of the entire buffer device.

[0031] The height of the fixed pin 16 can be adjusted by rotating the adjusting screw 14 to move it up and down in the slide groove 1302, and is locked and fixed by the first adjusting nut 1401 and the second adjusting nut 1402, so as to precisely control the trigger stroke of the spring steel plate 5 according to the load and speed of the elevator car; the number and thickness of the reinforcing steel plate 503 can be increased or decreased according to the buffer force requirements to adapt to different specifications of elevators.

[0032] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pitless elevator car buffer device, characterized in that: The system includes an elevator shaft and a channel steel support (13). Mounting grooves (1) are provided on both sides of the lower end of the elevator shaft. Mounting side plates (101) are provided within each mounting groove (1). Two mounting side plates (101) are configured and positioned opposite each other on the inner walls of the mounting grooves (1). A spring steel plate (5) is provided between the mounting side plates (101). A horizontal plate is provided at both ends of the spring steel plate (5). The spring steel plate (5) is rotatably connected to the mounting side plates (101) on both sides via a rotating shaft (6). A stop block (1011) is provided between the mounting side plates (101). Block (1011) is set on the side of the lower end of the spring steel plate (5) away from the elevator pit. A support assembly is set on the horizontal plate at the lower end of the spring steel plate (5). An auxiliary pulley assembly is also set between the mounting side plates (101). A first steel wire rope (18) is set at the lower end of the elevator shaft. The two ends of the first steel wire rope (18) pass around the auxiliary pulley assembly on both sides of the inner wall of the elevator shaft and are fixedly connected to the support assembly. The channel steel bracket (13) is set at both ends of the top of the elevator car. A hooking assembly that can be hooked on one end of the horizontal plate of the spring steel plate (5) is set on the channel steel bracket (13).

2. The pitless elevator car buffer device according to claim 1, characterized in that: The auxiliary pulley assembly includes a first auxiliary shaft (2) and a second auxiliary shaft (3). The second auxiliary shaft (3) is located below the stop block (1011), and a second auxiliary pulley (301) is provided on the second auxiliary shaft (3). The first auxiliary shaft (2) is located below the second auxiliary shaft (3) on the side close to the elevator shaft, and a first auxiliary pulley (201) is provided on the first auxiliary shaft (2). The end of the first wire rope (18) passes through the first auxiliary pulley (201) and the second auxiliary pulley (301) in sequence and is fixedly connected to the fulcrum assembly.

3. The pitless elevator car buffer device according to claim 2, characterized in that: The fulcrum assembly includes a bearing sleeve (502) and a first fulcrum pulley (7). The bearing sleeve (502) is provided on the horizontal plate at the lower end of the spring steel plate (5). There are two bearing sleeves (502) arranged opposite each other. The first fulcrum pulley (7) is provided between the bearing sleeves (502). The end of the first wire rope (18) passes through the first auxiliary pulley (201) and the second auxiliary pulley (301) in sequence and is fixedly connected to the first fulcrum pulley (7). The horizontal plate at the lower end of the spring steel plate (5) is provided with a slot (501) at the end near the first fulcrum pulley (7).

4. The pitless elevator car buffer device according to claim 3, characterized in that: It also includes a retraction assembly disposed within the mounting slot (1). The retraction assembly includes a third auxiliary shaft (4), a spring (8), a mounting bracket (11), and a second steel wire rope (22). The third auxiliary shaft (4) is disposed between the mounting side plates (101) and above the stop block (1011). A third auxiliary pulley (401) is disposed on the third auxiliary shaft (4). The mounting bracket (11) is disposed on the spring steel plate (5) away from the electric... On one side of the ladder shaft, two mounting brackets (11) are configured and arranged opposite each other. A fulcrum shaft (12) is provided between the mounting brackets (11). A second fulcrum pulley (1201) is provided on the fulcrum shaft (12). One end of the spring (8) is fixedly connected to the bottom of the mounting groove (1), and the other end is fixedly connected to one end of the second wire rope (22). The other end of the second wire rope (22) passes around the third auxiliary pulley (401) and is fixedly connected to the second fulcrum pulley (1201).

5. A pitless elevator car buffer device according to claim 1, characterized in that: The mounting assembly includes an adjusting screw (14) and a fixing pin (16). Fixing plates (1301) are provided on both sides of the channel steel bracket (13). The adjusting screw (14) passes through the middle of the fixing plate (1301). A first adjusting nut (1401) and a second adjusting nut (1402) are threaded onto the adjusting screw (14). The first adjusting nut (1401) is located at the bottom of the fixing plate (1301), and the second adjusting nut (1402) is located at the top of the fixing plate (1301). The fixing pin (16) is located at the top of the adjusting screw (14).

6. A pitless elevator car buffer device according to claim 5, characterized in that: Each adjusting screw (14) is provided with a collar (15) at the top, and the fixing pin (16) is sleeved inside the collar (15). The side walls of the channel steel bracket (13) are provided with sliding grooves (1302). Both ends of the fixing pin (16) pass through the sliding grooves (1302) and are slidably connected to them. One end of the fixing pin (16) is provided with a baffle (1601), and the other end is threaded with a fixing nut (17).

7. A pitless elevator car buffer device according to claim 4, characterized in that: The spring steel plate (5) is provided with a plurality of reinforcing steel plates (503) on the side near the elevator shaft. A U-shaped screw (9) is provided on one side of the reinforcing steel plate (503). A pressure plate (10) is detachably connected to the opening of the U-shaped screw (9). Both ends of the top of the U-shaped screw (9) are detachably connected to the bottom of the mounting bracket (11).

8. A pitless elevator car buffer device according to claim 7, characterized in that: The top two ends of the U-shaped screw (9) pass through the two ends of the pressure plate (10). The top two ends of the U-shaped screw (9) are threaded with a first fastening nut (901). The bottom of the mounting bracket (11) is fixedly connected to the top of the second fastening nut (1101). The bottom of the second fastening nut (1101) is threaded to the top of the U-shaped screw (9).

9. A pitless elevator car buffer device according to claim 1, characterized in that: Pull rings (19) are provided below the mounting grooves (1) on both sides of the inner wall of the elevator shaft, and the first steel wire rope (18) is threaded through the pull rings (19).

10. A pitless elevator car buffer device according to claim 9, characterized in that: It also includes a support plate (20), which is inserted through the middle section of the first wire rope (18), and both ends of the support plate (20) on the first wire rope (18) are provided with fixing buckles (21).

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