A buffer device for an elevator

Abstract

The scheme discloses an elevator buffer device in the technical field of elevator accessories, which comprises a hydraulic cylinder and an adjusting assembly. The hydraulic cylinder comprises a cylinder barrel and an I-shaped piston. The piston comprises a piston rod and piston heads and a support plate fixedly connected to both ends of the piston rod. The piston heads are slidably connected in the cylinder barrel, and the support plate is located outside the cylinder barrel. Working oil is injected into the cylinder barrel. The adjusting assembly comprises an adjusting barrel, a reset spring and a piston plate located in the adjusting barrel. The adjusting barrel is sleeved on the cylinder barrel. The piston plate is provided with a stepped hole. The smaller hole of the stepped hole is located at the top. The piston plate is slidably sleeved on the cylinder barrel through the smaller hole of the stepped hole. The two ends of the reset spring are fixedly connected to the inner top of the adjusting barrel and the piston plate, respectively. The wall body at the bottom of the cylinder barrel is provided with a one-way liquid inlet valve and a one-way liquid outlet valve which are in communication with the cylinder barrel and the adjusting barrel. The scheme effectively improves the buffer stroke of the buffer device, thereby improving the buffer effect.

Description

Technical Field

[0001] This invention belongs to the field of elevator parts technology, and specifically relates to a buffer device for elevators. Background Technology

[0002] During elevator operation, malfunctions such as control system failure, safety brake failure, or friction issues with the traction sheave groove can cause the elevator car to exceed the ground floor and fall into the pit at high speed, resulting in elevator damage and injuries. The primary solution to this problem is to install a buffer in the pit. The buffer's cushioning effect prevents the elevator car from directly impacting the bottom, protecting passengers, transported goods, and the elevator equipment.

[0003] For example, patent CN110446677A discloses a hydraulic buffer for elevators. Through the collision of the lifting body, the piston descends, causing a portion of the working oil to flow into the hollow section through the gap in the orifice. When the working oil in the oil chamber rapidly flows into the hollow section, the amount of working oil flowing out of the oil chamber is reduced by an amount equivalent to the volume of the flowing-in working oil, thus causing the piston head to descend. As the oil level drops sharply, the volume of the air storage section increases suddenly, thus the internal pressure becomes lower than atmospheric pressure, and air flows into the negative pressure air storage section from the outside through the third through-hole. This hydraulic buffer effectively cushions the falling car. However, because the return spring on the hydraulic buffer is connected between the support plate and the hydraulic cylinder, it still occupies a certain space vertically after being compressed. Since the depth of the shaft pit is limited (deepening the shaft pit would not only involve a large amount of engineering work, but also affect the stability of the building foundation since most shaft pits are connected to the foundation), the buffering distance of the hydraulic buffer is significantly shortened, reducing the buffering effect. Summary of the Invention

[0004] The present invention aims to provide a buffer device for elevators to improve the buffer stroke of the buffer device.

[0005] This solution provides an elevator buffer device comprising a hydraulic cylinder and an adjusting assembly. The hydraulic cylinder includes a cylinder barrel and an I-shaped piston. The piston includes a piston rod, a piston head and a support plate fixedly connected to both ends of the piston rod. The piston head is slidably connected inside the cylinder barrel, and the support plate is located outside the cylinder barrel. The cylinder barrel is filled with working oil. The adjusting assembly includes an adjusting cylinder, a return spring and a piston plate located inside the adjusting cylinder. The adjusting cylinder is sleeved on the cylinder barrel. The piston plate has a stepped hole, with the smaller hole at the top. The piston plate is slidably sleeved on the cylinder barrel through the smaller hole. The two ends of the return spring are fixedly connected to the inner top of the adjusting cylinder and the piston plate, respectively. A one-way inlet valve and a one-way outlet valve connecting the cylinder barrel and the adjusting cylinder are provided on the bottom wall of the cylinder barrel.

[0006] The working principle and beneficial effects of this solution are as follows: During operation, the buffer device is installed in the pit at the bottom of the shaft. When the car descends, the car acts on the support plate, causing the entire piston to move downwards. This forces some working oil through a one-way discharge valve into the regulating cylinder. The working oil entering the regulating cylinder initially reaches the larger hole in the stepped hole of the piston plate. Once a certain amount of working oil has entered the regulating cylinder, it lifts the piston plate, thereby compressing the return spring. After the car disengages from the buffer device, under the force of the return spring and the compressed air in the regulating cylinder, the working oil flows back into the cylinder through a one-way inlet valve. In this solution, because the return spring is located inside the regulating cylinder, the buffer stroke of the buffer device can be the same as the length of the piston rod. This avoids the problem in existing technologies where the return spring occupies vertical space, making it difficult to achieve the required buffer stroke length for the descending car. This improves the buffering effect of the buffer device on the descending car.

[0007] Furthermore, the regulating cylinder is also filled with working oil, which is located above the piston plate. Through the injection of working oil, during the piston plate's ascent, when the piston plate compresses the spring and drives the working oil in the regulating cylinder to the top of the cylinder, the rising piston plate simultaneously faces the reaction forces of air, the return spring, and the working oil. This helps reduce the subsequent compression on the return spring and extends its service life.

[0008] Furthermore, a sleeve assembly is connected to the lower surface of the support plate. The sleeve assembly is formed by connecting tubes whose diameter gradually decreases from bottom to top, with the lowermost connecting tube abutting against the inner top of the adjusting cylinder. The return spring extends into the connecting tube and is fixedly connected to the support plate. Through the sleeve assembly, the working oil in the cylinder and the return spring act simultaneously during the car's descent.

[0009] Furthermore, the top of the regulating cylinder is provided with an air vent. This air vent allows compressed air to escape during the process of the piston plate rising and pressing the return spring. Attached Figure Description

[0010] Figure 1 This is a front sectional view of a buffer device for an elevator according to Embodiment 1 of the present invention;

[0011] Figure 2 for Figure 1 A bottom view after removing the cylinder head;

[0012] Figure 3 This is a front sectional view of a buffer device for an elevator according to Embodiment 2 of the present invention;

[0013] Figure 4 This is a front sectional view of a buffer device for an elevator according to Embodiment 3 of the present invention;

[0014] Figure 5This is a front sectional view of a buffer device for an elevator according to Embodiment 4 of the present invention;

[0015] Figure 6 for Figure 5 Longitudinal sectional view of the middle sleeve assembly;

[0016] Figure 7 This is a front sectional view of a buffer device for an elevator according to Embodiment 5 of the present invention. Detailed Implementation

[0017] The following detailed description illustrates the specific implementation method:

[0018] The reference numerals in the accompanying drawings include: piston 1, cylinder 2, adjusting cylinder 3, return spring 4, working oil 5, piston plate 6, stepped hole 7, one-way liquid outlet valve 8, one-way liquid inlet valve 9, vent hole 10, and sleeve assembly 11.

[0019] Example 1 is basically as shown in the appendix. Figures 1-2 The following describes a buffer device for an elevator, comprising a hydraulic cylinder and an adjusting assembly. The hydraulic cylinder includes a cylinder barrel 2 and an I-shaped piston 1. The piston 1 includes a piston rod, piston heads fixedly connected to both ends of the piston rod, and a support plate. The support plate, piston rod, and piston head are integrally formed. The piston head is slidably connected inside the cylinder barrel 2. The piston rod extends to the outside of the top of the cylinder barrel 2. The cylinder barrel 2 is filled with working oil 5. The adjusting assembly includes an adjusting cylinder 3, a piston plate 6 located inside the adjusting cylinder 3, and twelve return springs 4. The adjusting cylinder 3 is sleeved on the cylinder barrel 2. Both the adjusting cylinder 3 and the cylinder barrel 2 are open at both ends. The bottom ends of the adjusting cylinder 3 and the cylinder barrel 2 are welded to the same cylinder cover to achieve a seal. The opening at the other end of the regulating cylinder 3 is fitted onto the cylinder 2 and welded to achieve a seal. The end of the cylinder 2 away from the cylinder head is sealed because the piston rod passes through it. The piston plate 6 is provided with a stepped hole 7, which is convex in shape. The piston plate 6 with the stepped hole 7 slides onto the cylinder 2 through the smaller hole of the stepped hole 7. The two ends of the return spring 4 are fixedly connected to the inner top of the regulating cylinder 3 and the piston plate 6, respectively. The twelve return springs 4 are arranged in groups of three on the front, back, left, and right sides of the cylinder 2. The bottom wall of the cylinder 2 is provided with a one-way inlet valve 9 and a one-way outlet valve 8. Both the one-way inlet valve 9 and the one-way outlet valve 8 enable communication between the regulating cylinder 3 and the cylinder 2.

[0020] Example 2 is basically as shown in the appendix. Figure 3 As shown, the only difference between it and Embodiment 1 is that the top of the regulating cylinder 3 is provided with an air outlet 10.

[0021] Example 3 is basically as shown in the appendix. Figure 4 As shown, the only difference between it and Example 1 is that the adjusting cylinder 3 is also filled with working oil 5, and the working oil 5 is located above the piston plate 6.

[0022] Example 4 is basically as shown in the appendix. Figure 5As shown, the only difference between this embodiment and Embodiment 1 is that a sleeve assembly 11 is connected to the lower surface of the support plate. The sleeve assembly 11 is formed by connecting tubes whose diameter gradually decreases from bottom to top (as shown in the attached figure). Figure 6 As shown), the bottom connecting tube abuts against the inner top of the adjusting cylinder 3, and the return spring 4 extends into the connecting tube and is fixedly connected to the support plate.

[0023] Example 5 is basically as shown in the appendix. Figure 7 As shown, the only difference between it and embodiment 6 is that the top of the regulating cylinder 3 is provided with an air outlet 10.

[0024] Taking Example 5 as an example, the specific implementation process is as follows: In use, the buffer device is installed in the pit of the shaft. When the car falls, the car acts on the support plate and causes the entire piston 1 to move downward. During the downward movement of the piston 1, the support plate acts on the return spring 4, the piston head acts on the working oil 5, and some of the working oil 5 is squeezed into the regulating cylinder 3 through the one-way outlet valve 8. The working oil 5 entering the regulating cylinder 3 is first located at the larger hole of the stepped hole 7 of the piston plate 6. When the amount of working oil 5 entering the regulating cylinder 3 reaches a certain level, it lifts the piston plate 6 and squeezes the return spring 4. At the same time, the return spring 4 is squeezed by the support plate, and the sleeve assembly 11 enters the regulating cylinder 3. When the return spring 4 is compressed to a certain extent and the sleeve assembly 11 is shortened to the shortest distance, the piston rod is completely inserted into the cylinder 2. At this time, the working intensity of the spring is reduced under the support of the sleeve assembly 11. After the car disengages from the buffer device, under the force of the return spring 4, the working oil 5 flows back into the cylinder 2 through the one-way inlet valve 9, and the sleeve assembly 11 extends.

[0025] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A buffer device for an elevator, comprising a hydraulic cylinder and an adjusting assembly, wherein the hydraulic cylinder comprises a cylinder barrel and an I-shaped piston, the piston comprising a piston rod and piston heads and a support plate fixedly connected to both ends of the piston rod, the piston heads being slidably connected inside the cylinder barrel, the support plate being located outside the cylinder barrel, and the cylinder barrel being filled with working oil; characterized in that: The adjusting assembly includes an adjusting cylinder and a return spring and piston plate located inside the adjusting cylinder. The adjusting cylinder is sleeved on the cylinder. The piston plate has a stepped hole, with the smaller hole at the top. The piston plate is slidably sleeved on the cylinder through the smaller hole. The two ends of the return spring are fixedly connected to the inner top of the adjusting cylinder and the piston plate, respectively. A one-way inlet valve and a one-way outlet valve are provided on the bottom wall of the cylinder, connecting the cylinder and the adjusting cylinder. Working oil is also filled into the adjusting cylinder, located above the piston plate. A sleeve assembly is connected to the lower surface of the support plate. The sleeve assembly is formed by connecting connecting pipes with gradually decreasing diameters from bottom to top, with the lowermost connecting pipe abutting against the inner top of the adjusting cylinder. The return spring extends into the connecting pipe and is fixedly connected to the support plate. In use, the buffer device is installed in the pit of the shaft. When the car falls, the car acts on the support plate, causing the entire piston to move downward and squeezing some working oil into the regulating cylinder through the one-way discharge valve. The working oil entering the regulating cylinder is first located at the larger hole of the stepped hole of the piston plate. When the amount of working oil entering the regulating cylinder reaches a certain level, it lifts the piston plate and squeezes the return spring. When the car disengages from the buffer device, under the force of the return spring and the compressed air in the regulating cylinder, the working oil flows back into the cylinder through the one-way inlet valve. Since the return spring is located in the regulating cylinder, the buffer stroke of the buffer device can be the same as the length of the piston rod.

2. The elevator buffer device according to claim 1, characterized in that: The top of the regulating cylinder is provided with an air outlet.

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