Elevator car damping structure

Abstract

This utility model discloses an elevator car vibration damping structure, including a cylinder (1), a piston (2) inside the cylinder (1), a spiral compression spring (3) at the bottom of the piston (2), an upper cavity (4) and a lower cavity (5) formed on the upper and lower sides of the piston (2), both the upper cavity (4) and the lower cavity (5) are filled with hydraulic oil, a damping oil passage (7) is provided between the upper cavity (4) and the lower cavity (5), an upper stud (8) extending out of the cylinder (1) is provided at the top of the piston (2), a guide cylinder (9) connected to the upper stud (8) is sleeved at the upper end of the cylinder (1), and a lower stud (10) is provided at the bottom of the cylinder (1); the guide cylinder (9) is threadedly connected to the upper stud (8), the upper stud (8) is slidably connected to the cylinder (1), and a sealing ring (11) is provided at the connection between the upper stud (8) and the cylinder (1). This utility model has the advantages of a long service life and good vibration damping effect.

Description

Technical Field

[0001] This utility model belongs to the field of elevators and relates to an elevator car vibration damping structure. Background Technology

[0002] The car is fixed to the car frame and connected to the elevator's traction system through the car frame to perform the rising and falling movements. During the operation of the car, vibration is inevitable, with the most significant vibration occurring during the stopping phase when the car is descending. To reduce car vibration and improve car comfort, a shock-absorbing structure connected to the car frame is usually installed at the bottom of the car to cushion the vibration.

[0003] Existing shock absorption structures are generally rubber blocks or rubber blocks with built-in compression springs. They generally have the following problems: rubber blocks are prone to aging and deformation after long-term use, resulting in poor shock absorption and a short service life. In addition, rubber blocks have a large elastic potential energy after being compressed, and continue to exert a rebound force on the car after the car stops, causing the car to oscillate repeatedly. The elastic potential energy of the rubber blocks is only dissipated after the car has oscillated several times, and the car only comes to a complete stop after that, resulting in poor shock absorption.

[0004] Therefore, existing damping structures have the drawbacks of short service life and poor damping effect. Utility Model Content

[0005] The purpose of this invention is to provide a vibration damping structure for elevator cars. This invention has the advantages of a long service life and good vibration damping effect.

[0006] The technical solution of this utility model is as follows: An elevator car vibration damping structure includes a cylinder body, a piston inside the cylinder body, a spiral compression spring at the bottom of the piston, an upper chamber and a lower chamber formed on the upper and lower sides of the piston respectively, both of which are filled with hydraulic oil, a damping oil passage between the upper and lower chambers, an upper stud extending out of the cylinder body at the top of the piston, a guide cylinder connected to the upper stud fitted at the upper end of the cylinder body, and a lower stud at the bottom of the cylinder body.

[0007] In the aforementioned elevator car vibration damping structure, the guide cylinder is threadedly connected to the upper stud, the upper stud is slidably connected to the cylinder body, and a sealing ring is provided at the connection between the upper stud and the cylinder body.

[0008] In the aforementioned elevator car vibration damping structure, the top of the guide cylinder is recessed downward to form a clearance area, and a locking nut connected to the stud is provided in the clearance area.

[0009] In the aforementioned elevator car vibration damping structure, the inner diameter of the guide cylinder is clearance-fitted with the outer diameter of the cylinder body, and a vertical guide groove is provided on the side wall of the guide cylinder, with a guide block fixed to the cylinder body inside the guide groove.

[0010] In the aforementioned elevator car vibration damping structure, the bottom of the guide cylinder extends radially outward to form a flange, and the bottom of the cylinder is provided with an annular rubber block, the bottom surface of the rubber block being aligned with the bottom surface of the cylinder.

[0011] Compared with existing technologies, this invention utilizes a compression spring to dampen the car's vibration. The compression spring is housed within a cylinder, with a piston at its upper end. The piston is connected to the car via a guide cylinder. When the car stops descending, part of the impact energy is converted into the elastic potential energy of the compression spring, and the other part is converted into heat and dissipated as hydraulic oil passes through the damping channel. This dual action improves the vibration damping effect. The main components providing damping resistance are the compression spring and hydraulic oil, which are less prone to aging and have a longer service life compared to rubber blocks used in long-term high-load operations. Furthermore, during vibration damping, the hydraulic oil provides damping force for the piston's movement, preventing the piston from oscillating back and forth when the compression spring's potential energy is released, thus avoiding car vibration and further improving the vibration damping effect. Therefore, this invention has the advantages of a longer service life and better vibration damping effect. Attached Figure Description

[0012] Figure 1 This is a front view structural diagram of this utility model.

[0013] Figure 2 This is a top view of the piston.

[0014] Figure 3 This is the left view of the guide tube.

[0015] The markings in the attached diagram are as follows: 1-Cylinder body, 2-Piston, 3-Compression spring, 4-Upper chamber, 5-Lower chamber, 7-Damping oil passage, 8-Upper stud, 9-Guide cylinder, 10-Lower stud, 11-Sealing ring, 12-Relief area, 13-Locking nut, 14-Guide groove, 15-Guide block, 16-Flange, 17-Rubber block, 18-Car, 19-Car frame, 20-First nut, 21-Second nut. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0017] Example: A vibration damping structure for an elevator car, such as Figure 1 As shown, the cylinder 1 is located between the car 18 and the car frame 19. The cylinder 1 contains a piston 2 with a diameter of 6 cm. The bottom of the piston 2 is provided with two spiral compression springs 3. The upper and lower sides of the piston 2 form an upper chamber 4 and a lower chamber 5, respectively. Both the upper chamber 4 and the lower chamber 5 are filled with No. 46 synthetic hydraulic oil. A damping oil passage 7 is provided between the upper chamber 4 and the lower chamber 5.

[0018] The piston 2 and cylinder 1 are fitted with a clearance. The outer diameter of the piston 2 should be no more than 0.1 mm smaller than the inner diameter of the cylinder 1. The damping oil passage 7 consists of small holes on the piston 2 and the gap between the piston 2 and the cylinder 1. The total area of ​​all small holes should be less than 5 square millimeters.

[0019] The piston 2 is provided with an upper stud 8 extending out of the cylinder 1. The upper stud 8 passes through the bottom plate of the car 18 and is fitted with a first nut 20. The upper end of the upper stud 8 is a threaded section and the lower end is a smooth shaft. The upper stud 8 is slidably connected to the cylinder 1. A sealing ring 11 is provided at the connection between the upper stud 8 and the cylinder 1. The sealing ring 11 is used to prevent hydraulic oil leakage in the cylinder 1.

[0020] The upper end of the cylinder body 1 is fitted with a guide cylinder 9 that is screwed to the upper stud 8. The top of the guide cylinder 9 is recessed downward to form a clearance area 12, and a locking nut 13 connected to the upper stud 8 is provided in the clearance area 12. The bottom of the cylinder body 1 is provided with a lower stud 10, which passes through the car frame 19 and is fitted with a second nut 21. The clearance area 12 is used to prevent the locking nut 13 from contacting the bottom of the car. The bottom of the car contacts the top surface of the guide cylinder 9, resulting in a large contact area and good structural strength.

[0021] The inner diameter of the guide cylinder 9 is clearance-fitted with the outer diameter of the cylinder body 1. The guide cylinder 9 and the cylinder body 1 cooperate to prevent the upper stud 8 from bending and to ensure smooth up-and-down movement of the piston. A vertical guide groove 14 is provided on the side wall of the guide cylinder 9. A guide block 15 fixed to the cylinder body 1 is provided in the guide groove 14. The thickness of the guide block 15 is 0.05-0.1mm less than the width of the guide groove 14. The guide block 15 ensures that there is no relative rotation between the guide cylinder 9 and the cylinder body 1.

[0022] The bottom of the guide cylinder 9 extends radially outward to form a flange 16. The bottom of the cylinder body 1 is provided with an annular rubber block 17. The bottom surface of the rubber block 17 is aligned with the bottom surface of the cylinder body 1. When the guide cylinder 9 moves downward, it contacts the rubber block 17 through the flange 16, thereby increasing the contact area and reducing the probability of damage to the rubber block 17.

[0023] Working Principle: The bottom of the car 18 is generally equipped with four damping structures, corresponding to each bottom corner. When the car frame 19 descends and stops under the action of the traction system, the inertia of the car 18 remains, applying pressure to the guide cylinder 9. The guide cylinder 9, through the upper stud 8, applies downward pressure to the piston 2. During the downward movement of the piston 2, the compression spring 3 is compressed, and the hydraulic oil in the lower chamber 5 enters the upper chamber 4 through the damping oil passage 7. The hydraulic oil experiences significant resistance when passing through the damping oil passage 7, causing the impact energy of the car to be converted into heat and dissipated. Because hydraulic oil passes through the damping oil passage 7 when the piston 2 moves, the piston 2 will not oscillate back and forth after the compression spring 3 rebounds, and the car 18 will not oscillate back and forth, resulting in good damping effect. In the event of elevator malfunction, the elevator brake activates, and the car 18 will experience an emergency stop. At this time, the compression stroke of the compression spring 3 increases significantly, and the flange 16 contacts the rubber block 17 for further cushioning. The rubber block 17 is normally unloaded, therefore it is not prone to aging and deformation.

[0024] The clearance fit between the inner diameter of the guide cylinder 9 and the outer diameter of the cylinder 1, and the clearance fit between the piston 2 and the cylinder 1, are mainly due to the temperature difference between summer and winter, as well as the heat generated by the piston 2 moving up and down, which causes dimensional changes in each component due to thermal expansion and contraction. To ensure smooth movement and prevent jamming, clearance fits are adopted.

Claims

1. A vibration damping structure for an elevator car, characterized in that: The cylinder (1) includes a piston (2) inside the cylinder (1), a spiral compression spring (3) at the bottom of the piston (2), an upper chamber (4) and a lower chamber (5) are formed on the upper and lower sides of the piston (2), hydraulic oil is filled in both the upper chamber (4) and the lower chamber (5), a damping oil passage (7) is provided between the upper chamber (4) and the lower chamber (5), an upper stud (8) extending out of the cylinder (1) is provided on the top of the piston (2), a guide cylinder (9) connected to the upper stud (8) is sleeved on the upper end of the cylinder (1), and a lower stud (10) is provided at the bottom of the cylinder (1).

2. The elevator car vibration damping structure according to claim 1, characterized in that: The guide cylinder (9) is threadedly connected to the upper stud (8), the upper stud (8) is slidably connected to the cylinder body (1), and a sealing ring (11) is provided at the connection between the upper stud (8) and the cylinder body (1).

3. The elevator car vibration damping structure according to claim 2, characterized in that: The top of the guide cylinder (9) is recessed downward to form a clearance area (12), and a locking nut (13) connected to the stud (8) is provided in the clearance area (12).

4. The elevator car vibration damping structure according to claim 1, characterized in that: The inner diameter of the guide cylinder (9) is clearance-fitted with the outer diameter of the cylinder body (1). A vertical guide groove (14) is provided on the side wall of the guide cylinder (9), and a guide block (15) fixed to the cylinder body (1) is provided in the guide groove (14).

5. The elevator car vibration damping structure according to claim 1, characterized in that: The bottom of the guide cylinder (9) extends radially outward to form a flange (16), and the bottom of the cylinder body (1) is provided with an annular rubber block (17), the bottom surface of the rubber block (17) being aligned with the bottom surface of the cylinder body (1).

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