Damping device for elevator car

Abstract

According to the damping device for the elevator car in the field of elevators, the multiple first hydraulic cylinders which are circumferentially distributed at equal intervals and communicate with one another are arranged, and the loads of the elevator car are evenly distributed on an upper disc through the guiding effect of the multiple first hydraulic cylinders which communicate with one another and the uniform distribution effect of hydraulic oil on the loads; the probability of horizontal vibration caused by uneven load of the lift car is reduced; meanwhile, a strain cylinder which is internally provided with a lifting disc and a second spring and communicates with the first hydraulic cylinder is matched to conduct secondary buffering on the load generated by the lift car, and an extrusion plate linked with the strain cylinder is matched to improve the stability of the lift car in the horizontal direction; in addition, through a damper arranged between the lower disc and the car frame, third-stage buffering is conducted on the car, the viscosity of the magnetorheological fluid is adjusted in real time in cooperation with an acceleration sensor and an electromagnetic coil, the stretching speed of the damper is controlled in real time, and then the damping response efficiency and the riding comfort are improved.

Description

Technical Field

[0001] The present invention relates to a shock absorption device, in particular to a shock absorption device for an elevator car applied to the field of elevators. Background Art

[0002] During the operation of an elevator, sudden changes in the car load caused by passengers getting in and out, especially the deviation of the car's center of gravity due to significant differences in the weights of passengers and uneven distribution of their standing positions, will directly induce compound vibration of the car. The traditional shock absorption device adopts a technical solution of installing an elastic shock absorption pad between the car and the car frame. Although it can effectively attenuate the vibration energy in the vertical direction, its structural characteristics determine that it has an inherent deficiency in buffering the horizontal vibration component. When the center of gravity of the car deviates, the phenomenon of local overload of the shock absorption pad is particularly prominent. This not only limits its absorption efficiency of horizontal vibration energy, but also exacerbates the uneven wear of the shock absorption pad, forming a vicious cycle of "attenuation of shock absorption efficiency - increased wear".

[0003] A patent with the publication number CN113401771B discloses an elevator car shock absorption device. The elevator car shock absorption device includes a side shock absorption mechanism. The side shock absorption mechanism includes a plurality of hoistway buffer members installed on the inner sidewall of the elevator shaft and a car buffer member installed on the outer sidewall of the elevator car. The hoistway buffer member includes a buffer block, a first telescopic guide post with two ends respectively connected to the buffer block and the sidewall of the elevator shaft, and a first spring member sleeved on the first telescopic guide post. One side of the buffer block close to the elevator car protrudes towards the elevator shaft, so that an arc-shaped groove is formed on the buffer block. One end of the first spring member is connected to the buffer block, and the other end is connected to the sidewall of the elevator shaft. The plurality of hoistway buffer members respectively correspond to the positions of the elevator shaft opening; the car buffer member includes a spring steel member connected to one side of the outer sidewall of the elevator car and a pushing member installed on the outer sidewall of the elevator car. The pushing member is connected to the spring steel member. The elevator car shock absorption device of the present invention can perform shock absorption and improve the comfort of passengers in the elevator car.

[0004] The above-mentioned prior art discloses hoistway buffer members and car buffer members, which buffer the horizontal vibration of the car, but do not solve the problem of uneven car load and center of gravity deviation caused by people getting in and out of the car, resulting in horizontal vibration of the car. Summary of the Invention

[0005] Aiming at the above-mentioned prior art, the technical problem to be solved by the present invention is that people getting in and out of the car easily cause the car to vibrate horizontally.

[0006] To solve the above problems, the present invention provides a shock absorption device for an elevator car, including a car; a pair of inner sliders are fixedly connected to the outer wall of the car, the inner sliders are slidably connected to inner slide rails, the inner slide rails are fixedly connected to a car frame, two pairs of outer sliders are fixedly connected to the outside of the car frame, the outer sliders are slidably connected to outer slide rails fixedly connected to the inner wall of the elevator shaft, and the upper end of the car frame is fixedly connected to a hoisting rope;

[0007] The lower end of the car is fixedly connected to an upper plate, a plurality of first hydraulic cylinders evenly distributed at equal intervals in a circumference are fixedly connected to the lower end of the upper plate, the lower end of the first hydraulic cylinders is fixedly connected to a lower plate, a plurality of dampers evenly distributed at equal intervals in a circumference are fixedly connected to the lower end of the lower plate, and the lower ends of the dampers are fixedly connected to the inner wall of the car frame; The first hydraulic cylinder includes a first piston rod fixedly connected to the upper plate and a first piston cylinder fixedly connected to the lower plate, the first piston rod is slidably nested in the first piston cylinder and abuts against a first spring arranged in the first piston cylinder;

[0008] A plurality of first hydraulic cylinders are all communicated with the inner cavity of the same strain cylinder through first conveying pipes. The strain cylinder includes a cylinder body fixedly connected to the lower plate and a lifting plate slidably connected to the inner wall of the cylinder body. The lifting plate divides the inner cavity of the strain cylinder into an upper cavity and a lower cavity. The upper cavity is communicated with the first conveying pipe, a second spring abutting against the lifting plate is arranged in the lower cavity, and the first hydraulic cylinders, the first conveying pipes and the upper cavity of the strain cylinder are all filled with hydraulic oil.

[0009] In the above-mentioned shock absorption device for an elevator car, through the plurality of mutually communicated first hydraulic cylinders and the strain cylinder, the load of the car is evenly transmitted to the car frame, reducing the probability of horizontal vibration of the car caused by uneven load.

[0010] As a further improvement of the present application, an extrusion assembly is arranged in each of the pair of inner sliders. The extrusion assembly includes an extrusion plate nested in the inner wall of the inner slider. The extrusion plate slidably abuts against the outer wall of the inner slide rail. A second hydraulic cylinder is fixedly connected to the side of the extrusion plate away from the inner slide rail. The second hydraulic cylinder is communicated with the lower cavity of the strain cylinder through a second conveying pipe, and the lower cavity of the strain cylinder is filled with hydraulic oil.

[0011] As a further improvement of the present application, a clamping assembly is arranged between a pair of outer sliders on the same side. The clamping assembly includes a plug-in block slidably connected to the car frame. The plug-in block is fixedly connected to the movable end of an electric push rod, the fixed end of the electric push rod is fixedly connected to the car frame, and a plug-in cavity matched with the plug-in block is opened on the outer slide rail.

[0012] As a further improvement of the present application, the damper includes a third piston rod fixedly connected to the lower plate and a third piston cylinder fixedly connected to the inner wall of the car frame. A third piston disc is fixedly connected to the lower end of the third piston rod. Third springs are arranged on both sides of the third piston disc and abut against the third piston disc. A plurality of flow holes evenly distributed at equal intervals in a circumference are opened on the third piston disc, and the third piston cylinder is filled with hydraulic transmission fluid.

[0013] As a further improvement of the present application, the hydraulic transmission fluid is a magnetorheological fluid. An electromagnetic coil is fixedly connected inside the barrel wall of the third piston barrel. The electromagnetic coil is electrically connected to a coil driver, and the coil driver is electrically connected to a controller fixedly connected to the upper end of the car. The controller is also connected to an acceleration sensor fixedly connected to the upper end of the car.

[0014] As a further improvement of the present application, the inner slider is a strip-shaped block with a concave cross-section, and the inner slide rail is a strip-shaped block with a convex cross-section. The number of pressing plates is three, and they are respectively arranged on three surfaces of the inner wall of the inner slider and are respectively fixedly connected to the second hydraulic cylinders.

[0015] As a further improvement of the present application, the second hydraulic cylinder includes a second piston rod fixedly connected to the pressing plate and a second piston barrel slidably connected to the second piston rod. The second piston barrel is fixedly connected to the inner slider; adjacent second piston barrels are fixedly connected and communicated through a third delivery pipe.

[0016] As a further improvement of the present application, a receiving cavity for accommodating the pressing plate and the second hydraulic cylinder is provided on the inner wall of the inner slider. The second delivery pipe extends into the receiving cavity and is communicated with the second hydraulic cylinder located in the middle position.

[0017] As a further improvement of the present application, the plug-in block includes a strip-shaped portion and a plurality of rhombic cones fixedly connected thereto. The plug-in cavity is a rectangular groove. The car frame is provided with an installation cavity for accommodating the plug-in block and the electric push rod. The strip-shaped portion is slidably connected to the inner wall of the installation cavity.

[0018] In summary, the present invention is provided with a plurality of first hydraulic cylinders that are circumferentially equidistantly distributed and interconnected. By utilizing the guiding effect of the plurality of interconnected first hydraulic cylinders and the uniform distribution effect of the hydraulic oil on the load, the load of the car is evenly distributed on the upper plate, reducing the probability of horizontal vibration of the car caused by uneven load; at the same time, in cooperation with the strain cylinder that is internally provided with a lifting plate and a second spring and is connected to the first hydraulic cylinder, a secondary buffer is provided for the load generated by the car, and in cooperation with the pressing plate linked to the strain cylinder, the stability of the car in the horizontal direction is improved; in addition, through the damper provided between the lower plate and the car frame, by using the flow holes opened on the third piston plate to block the flow rate of the magnetorheological fluid, the energy of the vibration is absorbed, reducing the frequency and amplitude of the vertical vibration of the car, providing a third-level buffer for the car, and in cooperation with the acceleration sensor and the electromagnetic coil to make targeted adjustments to the viscosity of the magnetorheological fluid, improving the response speed of the damper, and further improving the response efficiency of shock absorption and the riding comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present application;

[0020] Figure 2Schematic diagram of the explosion assembly structure of the present application;

[0021] Figure 3 Schematic diagram of the transverse sectional structure of the present application;

[0022] Figure 4 is Figure 3 Enlarged schematic diagram of part A in

[0023] Figure 5 Schematic diagram of the horizontal sectional structure of the present application at the position of the inner slider;

[0024] Figure 6 is Figure 5 Enlarged schematic diagram of part B in

[0025] Figure 7 Schematic diagram of the explosion assembly structure of the extrusion plate and the inner slider in the present application;

[0026] Figure 8 Schematic diagram of the linkage state of the first hydraulic cylinder and the extrusion plate in the present application;

[0027] Figure 9 is Figure 5 Enlarged schematic diagram of part C in

[0028] Figure 10 Schematic diagram of the three-dimensional structure of the insertion block and the electric push rod in the present application;

[0029] Figure 11 Schematic diagram of the assembly structure of the damper in the present application.

[0030] Explanation of the reference numerals in the figure:

[0031] 1, car; 2, inner slider; 201, accommodation cavity; 3, inner slide rail; 4, car frame; 401, installation cavity; 5, outer slider; 6, outer slide rail; 601, insertion cavity; 7, upper plate; 8, first hydraulic cylinder; 801, first piston rod; 802, first piston barrel; 803, first spring; 9, lower plate; 10, damper; 11, first delivery pipe; 12, strain cylinder; 1201, cylinder body; 1202, lifting plate; 1203, second spring; 13, second delivery pipe; 14, extrusion plate; 15, second hydraulic cylinder; 1501, second piston rod; 1502, second piston barrel; 16, third delivery pipe; 17, insertion block; 1701, strip portion; 1702, rhombic cone; 18, electric push rod; 19, third piston barrel; 20, third piston rod; 21, third piston disc; 2101, flow hole; 22, third spring; 23, electromagnetic coil; 24, acceleration sensor; 25, controller. Detailed implementation manners

[0032] The following will describe in detail two embodiments of the present application in conjunction with the accompanying drawings.

[0033] The first embodiment:

[0034] Figures 1-10 There is shown a shock-absorbing device for an elevator car, including a car 1; a pair of inner sliders 2 are fixedly connected to the outer wall of the car 1, the inner sliders 2 are slidably connected to an inner slide rail 3, the inner slide rail 3 is fixedly connected to a car frame 4, two pairs of outer sliders 5 are fixedly connected to the outside of the car frame 4, the outer sliders 5 are slidably connected to an outer slide rail 6 fixedly connected to the inner wall of the elevator shaft, and the upper end of the car frame 4 is fixedly connected to a hoisting rope;

[0035] Please refer to Figure 4 , a upper plate 7 is fixedly connected to the lower end of the car 1, a plurality of first hydraulic cylinders 8 evenly distributed in a circumferential equidistant manner are fixedly connected to the lower end of the upper plate 7, a lower plate 9 is fixedly connected to the lower end of the first hydraulic cylinders 8, a plurality of dampers 10 evenly distributed in a circumferential equidistant manner are fixedly connected to the lower end of the lower plate 9, and the lower end of the dampers 10 is fixedly connected to the inner wall of the car frame 4; the first hydraulic cylinder 8 includes a first piston rod 801 fixedly connected to the upper plate 7 and a first piston cylinder 802 fixedly connected to the lower plate 9, the first piston rod 801 is slidably nested in the first piston cylinder 802 and abuts against a first spring 803 arranged in the first piston cylinder 802;

[0036] Please refer to Figure 4 , a plurality of first hydraulic cylinders 8 are all communicated with the inner cavity of the same strain cylinder 12 through a first delivery pipe 11, the strain cylinder 12 includes a cylinder body 1201 fixedly connected to the lower plate 9 and a lifting plate 1202 slidably connected to the inner wall of the cylinder body 1201, the lifting plate 1202 divides the inner cavity of the strain cylinder 12 into an upper cavity and a lower cavity, the upper cavity is communicated with the first delivery pipe (11), a second spring 1203 abutting against the lifting plate 1202 is arranged in the lower cavity, and the first hydraulic cylinders 8, the first delivery pipe 11 and the upper cavity of the strain cylinder 12 are all filled with hydraulic oil.

[0037] Specifically, when passengers get in and out of the car 1, the load in the car 1 changes. The car 1 squeezes a plurality of first piston rods 801 distributed in a circumferential manner through the upper plate 7, the first spring 803 is compressed, and the first-stage buffering and shock absorption of the car 1 is carried out; and the hydraulic oil in a plurality of first piston cylinders 802 enters the strain cylinder 12 through the first delivery pipe 11, squeezes the lifting plate 1202, so that the second spring 1203 is compressed, and the second-stage buffering and shock absorption of the car 1 is carried out; at the same time, the lower plate 9 squeezes the dampers 10, and the third-stage shock absorption of the car 1 is carried out; in addition, since a plurality of first piston cylinders 802 are communicated with each other through the first delivery pipe 11 and the strain cylinder 12, the loads of the plurality of first hydraulic cylinders 8 evenly bear the load of the car 1, reducing the horizontal vibration of the car 1.

[0038] Compared with the existing car shock absorption device, the present invention is provided with a plurality of first hydraulic cylinders 8 that are evenly distributed at equal intervals in a circle and communicate with each other. By utilizing the guiding effect of the first hydraulic cylinders 8 and the uniform distribution effect of hydraulic oil on the load, the load of the car 1 is evenly distributed on the upper plate 7, reducing the center of gravity offset of the car 1 caused by uneven standing positions of the internal personnel, and further reducing the probability of horizontal vibration of the car 1 caused by the center of gravity offset. At the same time, in cooperation with the strain cylinder 12 that is provided with a lifting plate 1202 and a second spring 1203 inside and communicates with the first hydraulic cylinder 8, a secondary buffer is carried out on the load generated by the car 1. In addition, through the damper 10 arranged between the lower plate 9 and the car frame 4, the frequency and amplitude of the vertical vibration of the car 1 are reduced, and a third-level buffer is carried out on the car 1.

[0039] Please refer to Figure 7 and Figure 8 , an extrusion assembly is provided in each of the pair of inner sliders 2. The extrusion assembly includes an extrusion plate 14 nested in the inner wall of the inner slider 2. The extrusion plate 14 is in sliding contact with the outer wall of the inner slide rail 3. A second hydraulic cylinder 15 is fixedly connected to the side of the extrusion plate 14 away from the inner slide rail 3. The second hydraulic cylinder 15 communicates with the lower cavity of the strain cylinder 12 through a second delivery pipe 13, and the lower cavity of the strain cylinder 12 is filled with hydraulic oil.

[0040] Specifically, please refer to Figure 8 , when the lifting plate 1202 moves downward, the hydraulic oil in the lower cavity of the strain cylinder 12 is extruded and transported to the second hydraulic cylinder 15 through the second delivery pipe 13. The second hydraulic cylinder 15 pushes the extrusion plate 14 to move towards the inner slide rail 3, increasing the contact pressure between the extrusion plate 14 and the inner slide rail 3, so that the inner slider 2 is in close contact with the inner slide rail 3 through the extrusion plate 14, further reducing the horizontal vibration of the car 1. At the same time, the vertical sliding speed of the inner slider 2 relative to the inner slide rail 3 is reduced, and the vertical vibration speed is reduced.

[0041] Please refer to Figure 7 and Figure 8 , the inner slider 2 is a strip-shaped block with a concave cross-section, the inner slide rail 3 is a strip-shaped block with a convex cross-section, the number of extrusion plates 14 is three, and they are respectively arranged on three surfaces of the inner wall of the inner slider 2 and are respectively fixedly connected with second hydraulic cylinders 15.

[0042] Specifically, through a total of six extrusion plates 14 in the two inner sliders 2, the longitudinal and transverse directions at the contact position between the inner slider 2 and the inner slide rail 3 are restricted, further reducing the probability of horizontal vibration of the car 1 in the horizontal direction, and improving the vertical guiding effect and deceleration effect of the inner slide rail 3 on the inner slider 2.

[0043] Please refer to Figure 6, the second hydraulic cylinder 15 includes a second piston rod 1501 fixedly connected to the extrusion plate 14 and a second piston cylinder 1502 slidably connected to the second piston rod 1501. The second piston cylinder 1502 is fixedly connected to the inner slider 2; adjacent second piston cylinders 1502 are fixedly connected through a third delivery pipe 16.

[0044] Specifically, the hydraulic oil pressure is evenly transmitted to the three second hydraulic cylinders 15 and the extrusion plate 14 through the third delivery pipe 16.

[0045] Please refer to Figure 7 , a receiving cavity 201 for accommodating the extrusion plate 14 and the second hydraulic cylinder 15 is formed on the inner wall of the inner slider 2. The second delivery pipe 13 extends into the receiving cavity 201 and communicates with the second hydraulic cylinder 15 located at the middle position.

[0046] Specifically, the extrusion plate 14 and the second hydraulic cylinder 15 are installed in an embedded manner.

[0047] Please refer to Figure 3 , Figure 9 and Figure 10 , a clamping component is provided between a pair of outer sliders 5 on the same side. The clamping component includes a plugging block 17 slidably connected to the car frame 4. The plugging block 17 is fixedly connected to the movable end of an electric push rod 18. The fixed end of the electric push rod 18 is fixedly connected to the car frame 4. A plugging cavity 601 matching the plugging block 17 is formed on the outer slide rail 6.

[0048] Specifically, when the car 1 moves to the floor elevator entrance, the electric push rod 18 is started. The electric push rod 18 drives the plugging block 17 to insert into the plugging cavity 601 of the outer slide rail 6 to fix the car frame 4, so that the vibration of the car 1 on the fixed car frame 4 is reduced, and the stability of passengers when getting on and off the car 1 is further improved; the vibration probability of the car 1 caused by the elastic deformation of the traction rope is reduced.

[0049] Please refer to Figure 9 and Figure 10 , the plugging block 17 includes a strip portion 1701 and a plurality of prism pyramids 1702 fixedly connected thereto. The plugging cavity 601 is a rectangular groove. The car frame 4 is provided with an installation cavity 401 for accommodating the plugging block 17 and the electric push rod 18. The strip portion 1701 is slidably connected to the inner wall of the installation cavity 401.

[0050] Specifically, the prism pyramids 1702 facilitate the insertion of the plugging block 17 into the plugging cavity 601. After the prism pyramids 1702 are inserted into the plugging cavity 601, the strip portion 1701 still abuts against the inner wall of the installation cavity 401. The strip portion 1701 improves the bearing capacity and stability of the plugging block 17.

[0051] The second implementation mode:

[0052] Figure 1 , Figure 4 and Figure 11 show a shock absorption device for an elevator car. Based on the first embodiment, the damper 10 includes a third piston rod 20 fixedly connected to the lower disk 9 and a third piston cylinder 19 fixedly connected to the inner wall of the car frame 4. The lower end of the third piston rod 20 is fixedly connected with a third piston disk 21. On both sides of the third piston disk 21, there are third springs 22 arranged in the third piston cylinder 19. The third piston disk 21 is provided with a plurality of flow holes 2101 distributed at equal intervals in a circumferential manner. The third piston cylinder 19 is filled with a hydraulic transmission fluid.

[0053] Specifically, when the car 1 vibrates vertically, the third piston rod 20 drives the third piston disk 21 to move downward, and the hydraulic transmission fluid flows from below the third piston disk 21 through the flow holes 2101 to above the third piston disk 21, and the vibration energy is absorbed and decelerated by the flow of the hydraulic transmission fluid, improving the vertical shock absorption effect on the car 1.

[0054] Please refer to Figure 1 and Figure 4 , the hydraulic transmission fluid is a magnetorheological fluid. An electromagnetic coil 23 is fixedly connected inside the cylinder wall of the third piston cylinder 19. The electromagnetic coil 23 is electrically connected to a coil driver, and the coil driver is electrically connected to a controller 25 fixedly connected to the upper end of the car 1. The controller 25 is also connected to an acceleration sensor 24 fixedly connected to the upper end of the car 1.

[0055] Specifically, the vertical acceleration of the car 1 is monitored in real time through the acceleration sensor 24, and the magnetic field length of the electromagnetic coil 23 is controlled through the coil driver to control the viscosity of the magnetorheological fluid, and then the resistance of the magnetorheological fluid to the third piston disk 21 is controlled, and then the vertical vibration speed of the car 1 is adjusted, improving the riding comfort, and then the real-time change of the load in the car 1 is adjusted in real time and specifically, reducing the probability of vibration mutation of the car 1 caused by sudden change of the load; in addition, when the car starts and stops, due to inertia, relative movement will occur between the car 1 and the car frame 4. At this time, by adjusting the telescopic speed in the damper 10, the discomfort caused by inertia to the passengers can be partially offset; it should be noted that those skilled in the art can adjust the magnetic field strength of the electromagnetic coil 23 corresponding to the acceleration of the corresponding car 1 as needed, and this application will not elaborate.

[0056] Combined with the current actual needs, the above-mentioned embodiments adopted in this application, the protection scope is not limited thereto. Within the scope of knowledge possessed by those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A shock absorption device for an elevator car, characterized in that, It includes a car (1); a pair of inner sliders (2) are fixedly connected to the outer wall of the car (1), the inner sliders (2) are slidably connected to inner slide rails (3), the inner slide rails (3) are fixedly connected to a car frame (4), two pairs of outer sliders (5) are fixedly connected to the outside of the car frame (4), the outer sliders (5) are slidably connected to outer slide rails (6) fixedly connected to the inner wall of the elevator shaft, and the upper end of the car frame (4) is fixedly connected to a hoisting rope; A upper plate (7) is fixedly connected to the lower end of the car (1), a plurality of first hydraulic cylinders (8) evenly distributed at equal intervals in a circumferential manner are fixedly connected to the lower end of the upper plate (7), a lower plate (9) is fixedly connected to the lower end of the first hydraulic cylinders (8), a plurality of dampers (10) evenly distributed at equal intervals in a circumferential manner are fixedly connected to the lower end of the lower plate (9), and the lower ends of the dampers (10) are fixedly connected to the inner wall of the car frame (4); The first hydraulic cylinder (8) includes a first piston rod (801) fixedly connected to the upper plate (7) and a first piston barrel (802) fixedly connected to the lower plate (9), the first piston rod (801) is slidably nested in the first piston barrel (802) and abuts against a first spring (803) arranged in the first piston barrel (802); The plurality of first hydraulic cylinders (8) are all communicated with the inner cavity of the same strain cylinder (12) through first conveying pipes (11), the strain cylinder (12) includes a cylinder body (1201) fixedly connected to the lower plate (9) and a lifting plate (1202) slidably connected to the inner wall of the cylinder body (1201), the lifting plate (1202) divides the inner cavity of the strain cylinder (12) into an upper cavity and a lower cavity, the upper cavity is communicated with the first conveying pipe (11), a second spring (1203) abutting against the lifting plate (1202) is arranged in the lower cavity, and the first hydraulic cylinder (8), the first conveying pipe (11) and the upper cavity of the strain cylinder (12) are all filled with hydraulic oil.

2. The shock absorption device for an elevator car according to claim 1, wherein, An extrusion assembly is arranged in each of the pair of inner sliders (2), the extrusion assembly includes an extrusion plate (14) nested in the inner wall of the inner slider (2), the extrusion plate (14) is slidably abutted against the outer wall of the inner slide rail (3), a second hydraulic cylinder (15) is fixedly connected to the side of the extrusion plate (14) away from the inner slide rail (3), the second hydraulic cylinder (15) is communicated with the lower cavity of the strain cylinder (12) through a second conveying pipe (13), and the lower cavity of the strain cylinder (12) is filled with hydraulic oil.

3. The shock-absorbing device for an elevator car according to claim 2, characterized in that, A clamping assembly is arranged between a pair of outer sliders (5) on the same side, the clamping assembly includes a plug-in block (17) slidably connected to the car frame (4), the plug-in block (17) is fixedly connected to the movable end of an electric push rod (18), the fixed end of the electric push rod (18) is fixedly connected to the car frame (4), and a plug-in cavity (601) matched with the plug-in block (17) is formed on the outer slide rail (6).

4. The shock absorption device for an elevator car according to claim 3, characterized in that, The damper (10) includes a third piston rod (20) fixedly connected to the lower disc (9) and a third piston cylinder (19) fixedly connected to the inner wall of the car frame (4). A third piston disc (21) is fixedly connected to the lower end of the third piston rod (20). Third springs (22) arranged in the third piston cylinder (19) are abutted against both sides of the third piston disc (21). A plurality of flow holes (2101) equally distributed at circumferential intervals are formed in the third piston disc (21). The third piston cylinder (19) is filled with a hydraulic transmission fluid.

5. The shock-absorbing device for an elevator car according to claim 4, wherein The hydraulic transmission fluid is a magnetorheological fluid. An electromagnetic coil (23) is fixedly connected to the cylinder wall of the third piston cylinder (19). The electromagnetic coil (23) is electrically connected to a coil driver, and the coil driver is electrically connected to a controller (25) fixedly connected to the upper end of the car (1). The controller (25) is further connected to an acceleration sensor (24) fixedly connected to the upper end of the car (1).

6. The shock absorption device for an elevator car according to claim 2, characterized in that, The inner slider (2) is a strip-shaped block with a concave cross-section, and the inner slide rail (3) is a strip-shaped block with a convex cross-section. The number of the pressing plates (14) is three, and they are respectively arranged on three surfaces of the inner wall of the inner slider (2) and are respectively fixedly connected to second hydraulic cylinders (15).

7. The shock-absorbing device for an elevator car according to claim 6, characterized in that, The second hydraulic cylinder (15) includes a second piston rod (1501) fixedly connected to the pressing plate (14) and a second piston cylinder (1502) slidably connected to the second piston rod (1501). The second piston cylinder (1502) is fixedly connected to the inner slider (2); adjacent second piston cylinders (1502) are fixedly communicated through a third delivery pipe (16).

8. The shock-absorbing device for an elevator car according to claim 7, characterized in that, A receiving cavity (201) for receiving the pressing plate (14) and the second hydraulic cylinder (15) is formed in the inner wall of the inner slider (2). The second delivery pipe (13) extends into the receiving cavity (201) and is communicated with the second hydraulic cylinder (15) located at the middle position.

9. The shock absorption device for an elevator car according to claim 3, wherein The plug-in block (17) includes a strip-shaped portion (1701) and a plurality of rhombic cones (1702) fixedly connected thereto. The plug-in cavity (601) is a rectangular groove. The car frame (4) is provided with an installation cavity (401) for receiving the plug-in block (17) and the electric push rod (18). The strip-shaped portion (1701) is slidably connected to the inner wall of the installation cavity (401).

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